128957 has 4 divisors (see below), whose sum is σ = 132000. Its totient is φ = 125916.

The previous prime is 128951. The next prime is 128959. The reversal of 128957 is 759821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128957 - 2⁴ = 128941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128951) 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, 1457 + ... + 1542.

It is an arithmetic number, because the mean of its divisors is an integer number (33000).

2¹²⁸⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

128957 is a deficient number, since it is larger than the sum of its proper divisors (3043).

128957 is an equidigital number, since it uses as much as digits as its factorization.

128957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042.

The product of its digits is 5040, while the sum is 32.

The square root of 128957 is about 359.1058339821. The cubic root of 128957 is about 50.5221286545.

The spelling of 128957 in words is "one hundred twenty-eight thousand, nine hundred fifty-seven".