129247904 has 12 divisors (see below), whose sum is σ = 254456874. Its totient is φ = 64623936.

The previous prime is 129247883. The next prime is 129247907. The reversal of 129247904 is 409742921.

It can be written as a sum of positive squares in only one way, i.e., 68095504 + 61152400 = 8252^2 + 7820^2 .

It is not an unprimeable number, because it can be changed into a prime (129247907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2019467 + ... + 2019530.

Almost surely, 2^129247904 is an apocalyptic number.

It is an amenable number.

129247904 is a deficient number, since it is larger than the sum of its proper divisors (125208970).

129247904 is an equidigital number, since it uses as much as digits as its factorization.

129247904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4039007 (or 4038999 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 129247904 is about 11368.7248185538. The cubic root of 129247904 is about 505.6008976243.

The spelling of 129247904 in words is "one hundred twenty-nine million, two hundred forty-seven thousand, nine hundred four".