399723408 has 120 divisors (see below), whose sum is σ = 1284286848. Its totient is φ = 113688576.

The previous prime is 399723377. The next prime is 399723421. The reversal of 399723408 is 804327993.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 258285 + ... + 259827.

Almost surely, 2^399723408 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 399723408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642143424).

399723408 is an abundant number, since it is smaller than the sum of its proper divisors (884563440).

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

399723408 is a wasteful number, since it uses less digits than its factorization.

399723408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821 (or 1812 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 399723408 is about 19993.0840042251. The cubic root of 399723408 is about 736.6364316285.

The spelling of 399723408 in words is "three hundred ninety-nine million, seven hundred twenty-three thousand, four hundred eight".