399867718 has 16 divisors (see below), whose sum is σ = 621312480. Its totient is φ = 192782016.

The previous prime is 399867701. The next prime is 399867737. The reversal of 399867718 is 817768993.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 43546 + ... + 51922.

It is an arithmetic number, because the mean of its divisors is an integer number (38832030).

Almost surely, 2^399867718 is an apocalyptic number.

399867718 is a deficient number, since it is larger than the sum of its proper divisors (221444762).

399867718 is a wasteful number, since it uses less digits than its factorization.

399867718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9231.

The product of its digits is 4572288, while the sum is 58.

The square root of 399867718 is about 19996.6926765403. The cubic root of 399867718 is about 736.7250689305.

The spelling of 399867718 in words is "three hundred ninety-nine million, eight hundred sixty-seven thousand, seven hundred eighteen".