399885372 has 18 divisors (see below), whose sum is σ = 1010821448. Its totient is φ = 133295112.

The previous prime is 399885359. The next prime is 399885377. The reversal of 399885372 is 273588993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399885377) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5553928 + ... + 5553999.

Almost surely, 2^399885372 is an apocalyptic number.

It is an amenable number.

399885372 is an abundant number, since it is smaller than the sum of its proper divisors (610936076).

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

399885372 is a wasteful number, since it uses less digits than its factorization.

399885372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11107937 (or 11107932 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 399885372 is about 19997.1340946647. The cubic root of 399885372 is about 736.7359108101.

The spelling of 399885372 in words is "three hundred ninety-nine million, eight hundred eighty-five thousand, three hundred seventy-two".