128942925 has 12 divisors (see below), whose sum is σ = 213185760. Its totient is φ = 68769520.

The previous prime is 128942921. The next prime is 128942927. The reversal of 128942925 is 529249821.

It is a happy number.

It is not a de Polignac number, because 128942925 - 2² = 128942921 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128942921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 859545 + ... + 859694.

It is an arithmetic number, because the mean of its divisors is an integer number (17765480).

Almost surely, 2^128942925 is an apocalyptic number.

128942925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128942925 is a deficient number, since it is larger than the sum of its proper divisors (84242835).

128942925 is a wasteful number, since it uses less digits than its factorization.

128942925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719252 (or 1719247 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 128942925 is about 11355.3038268467. The cubic root of 128942925 is about 505.2029050987.

The spelling of 128942925 in words is "one hundred twenty-eight million, nine hundred forty-two thousand, nine hundred twenty-five".