129749904 has 40 divisors (see below), whose sum is σ = 372431520. Its totient is φ = 43249824.

The previous prime is 129749897. The next prime is 129749927. The reversal of 129749904 is 409947921.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 129749904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149742 + ... + 150605.

It is an arithmetic number, because the mean of its divisors is an integer number (9310788).

Almost surely, 2^129749904 is an apocalyptic number.

It is an amenable number.

129749904 is an abundant number, since it is smaller than the sum of its proper divisors (242681616).

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

129749904 is a wasteful number, since it uses less digits than its factorization.

129749904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300364 (or 300352 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 129749904 is about 11390.7815359614. The cubic root of 129749904 is about 506.2546380919.

The spelling of 129749904 in words is "one hundred twenty-nine million, seven hundred forty-nine thousand, nine hundred four".