157857 has 8 divisors (see below), whose sum is σ = 240576. Its totient is φ = 90192.

The previous prime is 157841. The next prime is 157867. The reversal of 157857 is 758751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157857 - 2⁴ = 157841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3738 + ... + 3779.

It is an arithmetic number, because the mean of its divisors is an integer number (30072).

2¹⁵⁷⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

157857 is a deficient number, since it is larger than the sum of its proper divisors (82719).

157857 is an equidigital number, since it uses as much as digits as its factorization.

157857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7527.

The product of its digits is 9800, while the sum is 33.

The square root of 157857 is about 397.3122197970. The cubic root of 157857 is about 54.0448872316.

It can be divided in two parts, 15 and 7857, that multiplied together give a triangular number (117855 = T₄₈₅).

The spelling of 157857 in words is "one hundred fifty-seven thousand, eight hundred fifty-seven".