400356857 has 4 divisors (see below), whose sum is σ = 408875136. Its totient is φ = 391838580.

The previous prime is 400356823. The next prime is 400356863. The reversal of 400356857 is 758653004.

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 400356857 - 2⁶ = 400356793 is a prime.

It is a super-2 number, since 2×400356857² = 320571225893836898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400356857.

It is not an unprimeable number, because it can be changed into a prime (400356157) 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, 4259069 + ... + 4259162.

It is an arithmetic number, because the mean of its divisors is an integer number (102218784).

Almost surely, 2^400356857 is an apocalyptic number.

400356857 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

400356857 is a deficient number, since it is larger than the sum of its proper divisors (8518279).

400356857 is an equidigital number, since it uses as much as digits as its factorization.

400356857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518278.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 400356857 is about 20008.9194360915. The cubic root of 400356857 is about 737.0253466720.

The spelling of 400356857 in words is "four hundred million, three hundred fifty-six thousand, eight hundred fifty-seven".