399331384 has 32 divisors (see below), whose sum is σ = 756504000. Its totient is φ = 197608320.

The previous prime is 399331351. The next prime is 399331399. The reversal of 399331384 is 483133993.

It is a self number, because there is not a number n which added to its sum of digits gives 399331384.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437889 + ... + 438799.

It is an arithmetic number, because the mean of its divisors is an integer number (23640750).

Almost surely, 2^399331384 is an apocalyptic number.

It is an amenable number.

399331384 is a deficient number, since it is larger than the sum of its proper divisors (357172616).

399331384 is a wasteful number, since it uses less digits than its factorization.

399331384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1419 counting only the distinct ones).

The product of its digits is 209952, while the sum is 43.

The square root of 399331384 is about 19983.2776090410. The cubic root of 399331384 is about 736.3955370402.

The spelling of 399331384 in words is "three hundred ninety-nine million, three hundred thirty-one thousand, three hundred eighty-four".