125857 has 4 divisors (see below), whose sum is σ = 126976. Its totient is φ = 124740.

The previous prime is 125821. The next prime is 125863. The reversal of 125857 is 758521.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 125857 - 2¹⁵ = 93089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125887) 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, 369 + ... + 622.

It is an arithmetic number, because the mean of its divisors is an integer number (31744).

2¹²⁵⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

125857 is a deficient number, since it is larger than the sum of its proper divisors (1119).

125857 is an equidigital number, since it uses as much as digits as its factorization.

125857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118.

The product of its digits is 2800, while the sum is 28.

The square root of 125857 is about 354.7633013715. The cubic root of 125857 is about 50.1140065194.

The spelling of 125857 in words is "one hundred twenty-five thousand, eight hundred fifty-seven".