399916318 has 16 divisors (see below), whose sum is σ = 628937856. Its totient is φ = 190353240.

The previous prime is 399916303. The next prime is 399916331. The reversal of 399916318 is 813619993.

It is a super-2 number, since 2×399916318² = 319866122805354248, which contains 22 as substring.

It is a congruent 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, 10896 + ... + 30307.

It is an arithmetic number, because the mean of its divisors is an integer number (39308616).

Almost surely, 2^399916318 is an apocalyptic number.

399916318 is a deficient number, since it is larger than the sum of its proper divisors (229021538).

399916318 is a wasteful number, since it uses less digits than its factorization.

399916318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41439.

The product of its digits is 314928, while the sum is 49.

The square root of 399916318 is about 19997.9078405717. The cubic root of 399916318 is about 736.7549149573.

The spelling of 399916318 in words is "three hundred ninety-nine million, nine hundred sixteen thousand, three hundred eighteen".