399673824 has 192 divisors, whose sum is σ = 1225082880. Its totient is φ = 112896000.

The previous prime is 399673819. The next prime is 399673831. The reversal of 399673824 is 428376993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 949134 + ... + 949554.

It is an arithmetic number, because the mean of its divisors is an integer number (6380640).

Almost surely, 2^399673824 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 399673824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (612541440).

399673824 is an abundant number, since it is smaller than the sum of its proper divisors (825409056).

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

399673824 is a wasteful number, since it uses less digits than its factorization.

399673824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 497 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 51.

The square root of 399673824 is about 19991.8439369659. The cubic root of 399673824 is about 736.6059714900.

The spelling of 399673824 in words is "three hundred ninety-nine million, six hundred seventy-three thousand, eight hundred twenty-four".