400857 has 8 divisors (see below), whose sum is σ = 547680. Its totient is φ = 260640.

The previous prime is 400853. The next prime is 400859. The reversal of 400857 is 758004.

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

It is not a de Polignac number, because 400857 - 2² = 400853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1507 + ... + 1752.

It is an arithmetic number, because the mean of its divisors is an integer number (68460).

2⁴⁰⁰⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

400857 is a deficient number, since it is larger than the sum of its proper divisors (146823).

400857 is a wasteful number, since it uses less digits than its factorization.

400857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 400857 is about 633.1326875150. The cubic root of 400857 is about 73.7332126878.

The spelling of 400857 in words is "four hundred thousand, eight hundred fifty-seven".