399920016 has 20 divisors (see below), whose sum is σ = 1033126832. Its totient is φ = 133306656.

The previous prime is 399920009. The next prime is 399920029. The reversal of 399920016 is 610029993.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4165786 + ... + 4165881.

Almost surely, 2^399920016 is an apocalyptic number.

It is an amenable number.

399920016 is an abundant number, since it is smaller than the sum of its proper divisors (633206816).

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

399920016 is a wasteful number, since it uses less digits than its factorization.

399920016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331678 (or 8331672 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 399920016 is about 19998.0003000300. Note that the first 3 decimals coincide. The cubic root of 399920016 is about 736.7571858584.

The spelling of 399920016 in words is "three hundred ninety-nine million, nine hundred twenty thousand, sixteen".