129275490 has 32 divisors (see below), whose sum is σ = 315524160. Its totient is φ = 33888704.

The previous prime is 129275483. The next prime is 129275491. The reversal of 129275490 is 94572921.

It is not an unprimeable number, because it can be changed into a prime (129275491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34749 + ... + 38288.

It is an arithmetic number, because the mean of its divisors is an integer number (9860130).

Almost surely, 2^129275490 is an apocalyptic number.

129275490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129275490 is an abundant number, since it is smaller than the sum of its proper divisors (186248670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129275490 is a wasteful number, since it uses less digits than its factorization.

129275490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73106.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 129275490 is about 11369.9379945539. The cubic root of 129275490 is about 505.6368660069.

The spelling of 129275490 in words is "one hundred twenty-nine million, two hundred seventy-five thousand, four hundred ninety".