399683328 has 288 divisors, whose sum is σ = 1292723712. Its totient is φ = 109035520.

The previous prime is 399683327. The next prime is 399683381. The reversal of 399683328 is 823386993.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399683321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17377525 + ... + 17377547.

It is an arithmetic number, because the mean of its divisors is an integer number (4488624).

Almost surely, 2^399683328 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 399683328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (646361856).

399683328 is an abundant number, since it is smaller than the sum of its proper divisors (893040384).

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

399683328 is a wasteful number, since it uses less digits than its factorization.

399683328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 56 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 51.

The square root of 399683328 is about 19992.0816324864. The cubic root of 399683328 is about 736.6118101241.

The spelling of 399683328 in words is "three hundred ninety-nine million, six hundred eighty-three thousand, three hundred twenty-eight".