129947904 has 54 divisors (see below), whose sum is σ = 374678486. Its totient is φ = 43315200.

The previous prime is 129947879. The next prime is 129947911. The reversal of 129947904 is 409749921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 116640000 + 13307904 = 10800^2 + 3648^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129947904.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25897 + ... + 30504.

Almost surely, 2^129947904 is an apocalyptic number.

It is an amenable number.

129947904 is an abundant number, since it is smaller than the sum of its proper divisors (244730582).

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

129947904 is an equidigital number, since it uses as much as digits as its factorization.

129947904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56423 (or 56406 counting only the distinct ones).

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

The square root of 129947904 is about 11399.4694613390. The cubic root of 129947904 is about 506.5120242121.

The spelling of 129947904 in words is "one hundred twenty-nine million, nine hundred forty-seven thousand, nine hundred four".