129392972 has 12 divisors (see below), whose sum is σ = 226522296. Its totient is φ = 64672320.

The previous prime is 129392971. The next prime is 129392987. The reversal of 129392972 is 279293921.

It is not an unprimeable number, because it can be changed into a prime (129392971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11972 + ... + 20052.

It is an arithmetic number, because the mean of its divisors is an integer number (18876858).

Almost surely, 2^129392972 is an apocalyptic number.

It is an amenable number.

129392972 is a deficient number, since it is larger than the sum of its proper divisors (97129324).

129392972 is a wasteful number, since it uses less digits than its factorization.

129392972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12088 (or 12086 counting only the distinct ones).

The product of its digits is 122472, while the sum is 44.

The square root of 129392972 is about 11375.1031643673. The cubic root of 129392972 is about 505.7899892445.

The spelling of 129392972 in words is "one hundred twenty-nine million, three hundred ninety-two thousand, nine hundred seventy-two".