Round a number up to certain significant figures

[brocq_18]

import math
maxValue = 12345678
a = maxValue/4.0 # Python 2.x requires either numerator/denominator to be a float to return one
print "This is the value of a", a
print "This is the ceiling of the division", math.ceil(a) 

This is the value of a 3086419.5
This is the ceiling of the division 3086420.0

How can I amend the degree to which the value is rounded up?
Is it possible to round up to say 3090000.0?