399888912 has 20 divisors (see below), whose sum is σ = 1033046480. Its totient is φ = 133296288.

The previous prime is 399888899. The next prime is 399888913. The reversal of 399888912 is 219888993.

It is a super-2 number, since 2×399888912² = 319822283881087488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399888913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4165462 + ... + 4165557.

It is an arithmetic number, because the mean of its divisors is an integer number (51652324).

Almost surely, 2^399888912 is an apocalyptic number.

It is an amenable number.

399888912 is an abundant number, since it is smaller than the sum of its proper divisors (633157568).

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

399888912 is a wasteful number, since it uses less digits than its factorization.

399888912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8331030 (or 8331024 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 57.

The square root of 399888912 is about 19997.2226071522. Note that the first 3 decimals coincide. The cubic root of 399888912 is about 736.7380847976.

The spelling of 399888912 in words is "three hundred ninety-nine million, eight hundred eighty-eight thousand, nine hundred twelve".