400812918 has 16 divisors (see below), whose sum is σ = 874501056. Its totient is φ = 121458440.

The previous prime is 400812917. The next prime is 400812941. The reversal of 400812918 is 819218004.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400812913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3036396 + ... + 3036527.

It is an arithmetic number, because the mean of its divisors is an integer number (54656316).

Almost surely, 2^400812918 is an apocalyptic number.

400812918 is an abundant number, since it is smaller than the sum of its proper divisors (473688138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400812918 is a wasteful number, since it uses less digits than its factorization.

400812918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6072939.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 400812918 is about 20020.3126349216. The cubic root of 400812918 is about 737.3050978985.

It can be divided in two parts, 400 and 812918, that added together give a palindrome (813318).

The spelling of 400812918 in words is "four hundred million, eight hundred twelve thousand, nine hundred eighteen".