399354672 has 20 divisors (see below), whose sum is σ = 1031666360. Its totient is φ = 133118208.

The previous prime is 399354661. The next prime is 399354689. The reversal of 399354672 is 276453993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 8319889 = 399354672 / (3 + 9 + 9 + 3 + 5 + 4 + 6 + 7 + 2).

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, 4159897 + ... + 4159992.

It is an arithmetic number, because the mean of its divisors is an integer number (51583318).

Almost surely, 2^399354672 is an apocalyptic number.

It is an amenable number.

399354672 is an abundant number, since it is smaller than the sum of its proper divisors (632311688).

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

399354672 is a wasteful number, since it uses less digits than its factorization.

399354672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8319900 (or 8319894 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 48.

The square root of 399354672 is about 19983.8602877422. The cubic root of 399354672 is about 736.4098516726.

The spelling of 399354672 in words is "three hundred ninety-nine million, three hundred fifty-four thousand, six hundred seventy-two".