400858 has 8 divisors (see below), whose sum is σ = 617652. Its totient is φ = 194976.

The previous prime is 400853. The next prime is 400859. The reversal of 400858 is 858004.

It can be written as a sum of positive squares in 2 ways, for example, as 400689 + 169 = 633^2 + 13^2 .

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

It is an Ulam number.

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

400858 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 2635 + ... + 2782.

2⁴⁰⁰⁸⁵⁸ is an apocalyptic number.

400858 is a deficient number, since it is larger than the sum of its proper divisors (216794).

400858 is a wasteful number, since it uses less digits than its factorization.

400858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5456.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 400858 is about 633.1334772384. The cubic root of 400858 is about 73.7332740007.

The spelling of 400858 in words is "four hundred thousand, eight hundred fifty-eight".