128957939 has 16 divisors (see below), whose sum is σ = 143679744. Its totient is φ = 114760800.

The previous prime is 128957929. The next prime is 128957951. The reversal of 128957939 is 939759821.

It is not a de Polignac number, because 128957939 - 2²⁰ = 127909363 is a prime.

It is a super-2 number, since 2×128957939² = 33260300062255442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128957929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126797 + ... + 127809.

It is an arithmetic number, because the mean of its divisors is an integer number (8979984).

Almost surely, 2^128957939 is an apocalyptic number.

128957939 is a deficient number, since it is larger than the sum of its proper divisors (14721805).

128957939 is a wasteful number, since it uses less digits than its factorization.

128957939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258.

The product of its digits is 1224720, while the sum is 53.

The square root of 128957939 is about 11355.9649083642. The cubic root of 128957939 is about 505.2225127973. Note that the first 3 decimals are identical.

The spelling of 128957939 in words is "one hundred twenty-eight million, nine hundred fifty-seven thousand, nine hundred thirty-nine".