399937392 has 80 divisors (see below), whose sum is σ = 1155759360. Its totient is φ = 132408000.

The previous prime is 399937379. The next prime is 399937423. The reversal of 399937392 is 293739993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62167 + ... + 68297.

It is an arithmetic number, because the mean of its divisors is an integer number (14446992).

Almost surely, 2^399937392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399937392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (577879680).

399937392 is an abundant number, since it is smaller than the sum of its proper divisors (755821968).

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

399937392 is a wasteful number, since it uses less digits than its factorization.

399937392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6299 (or 6287 counting only the distinct ones).

The product of its digits is 2480058, while the sum is 54.

The square root of 399937392 is about 19998.4347387489. The cubic root of 399937392 is about 736.7678560816.

The spelling of 399937392 in words is "three hundred ninety-nine million, nine hundred thirty-seven thousand, three hundred ninety-two".