129924725 has 36 divisors (see below), whose sum is σ = 190327104. Its totient is φ = 87706080.

The previous prime is 129924721. The next prime is 129924749. The reversal of 129924725 is 527429921.

It is not a de Polignac number, because 129924725 - 2² = 129924721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129924721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 81284 + ... + 82866.

It is an arithmetic number, because the mean of its divisors is an integer number (5286864).

Almost surely, 2^129924725 is an apocalyptic number.

It is an amenable number.

129924725 is a deficient number, since it is larger than the sum of its proper divisors (60402379).

129924725 is a wasteful number, since it uses less digits than its factorization.

129924725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674 (or 1662 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 129924725 is about 11398.4527458774. The cubic root of 129924725 is about 506.4819066548.

The spelling of 129924725 in words is "one hundred twenty-nine million, nine hundred twenty-four thousand, seven hundred twenty-five".