400997163 has 16 divisors (see below), whose sum is σ = 613138176. Its totient is φ = 228355680.

The previous prime is 400997143. The next prime is 400997189. The reversal of 400997163 is 361799004.

It is not a de Polignac number, because 400997163 - 2⁸ = 400996907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400997143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26433 + ... + 38738.

It is an arithmetic number, because the mean of its divisors is an integer number (38321136).

Almost surely, 2^400997163 is an apocalyptic number.

400997163 is a deficient number, since it is larger than the sum of its proper divisors (212141013).

400997163 is a wasteful number, since it uses less digits than its factorization.

400997163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65474.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 400997163 is about 20024.9135578659. The cubic root of 400997163 is about 737.4180549765.

The spelling of 400997163 in words is "four hundred million, nine hundred ninety-seven thousand, one hundred sixty-three".