399968272 has 20 divisors (see below), whose sum is σ = 845387856. Its totient is φ = 181803680.

The previous prime is 399968269. The next prime is 399968279. The reversal of 399968272 is 272869993.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (399968279) 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, 1136098 + ... + 1136449.

Almost surely, 2^399968272 is an apocalyptic number.

It is an amenable number.

399968272 is an abundant number, since it is smaller than the sum of its proper divisors (445419584).

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

399968272 is a wasteful number, since it uses less digits than its factorization.

399968272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272566 (or 2272560 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 55.

The square root of 399968272 is about 19999.2067842702. The cubic root of 399968272 is about 736.7868180544.

The spelling of 399968272 in words is "three hundred ninety-nine million, nine hundred sixty-eight thousand, two hundred seventy-two".