400693994 has 16 divisors (see below), whose sum is σ = 637459200. Its totient is φ = 188493360.

The previous prime is 400693981. The next prime is 400694039. The reversal of 400693994 is 499396004.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68594 + ... + 74205.

It is an arithmetic number, because the mean of its divisors is an integer number (39841200).

Almost surely, 2^400693994 is an apocalyptic number.

400693994 is a deficient number, since it is larger than the sum of its proper divisors (236765206).

400693994 is a wasteful number, since it uses less digits than its factorization.

400693994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142885.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 400693994 is about 20017.3423310888. The cubic root of 400693994 is about 737.2321694897.

The spelling of 400693994 in words is "four hundred million, six hundred ninety-three thousand, nine hundred ninety-four".