155857 has 8 divisors (see below), whose sum is σ = 176960. Its totient is φ = 136080.

The previous prime is 155851. The next prime is 155861. The reversal of 155857 is 758551.

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

It is a cyclic number.

It is not a de Polignac number, because 155857 - 2³ = 155849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155851) 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, 69 + ... + 562.

It is an arithmetic number, because the mean of its divisors is an integer number (22120).

2¹⁵⁵⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

155857 is a deficient number, since it is larger than the sum of its proper divisors (21103).

155857 is a wasteful number, since it uses less digits than its factorization.

155857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663.

The product of its digits is 7000, while the sum is 31.

The square root of 155857 is about 394.7872844963. The cubic root of 155857 is about 53.8156723871.

The spelling of 155857 in words is "one hundred fifty-five thousand, eight hundred fifty-seven".