399356384 has 144 divisors (see below), whose sum is σ = 990259200. Its totient is φ = 155105280.

The previous prime is 399356317. The next prime is 399356393. The reversal of 399356384 is 483653993.

It is a congruent 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, 2006717 + ... + 2006915.

It is an arithmetic number, because the mean of its divisors is an integer number (6876800).

Almost surely, 2^399356384 is an apocalyptic number.

399356384 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399356384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495129600).

399356384 is an abundant number, since it is smaller than the sum of its proper divisors (590902816).

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

399356384 is a wasteful number, since it uses less digits than its factorization.

399356384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 256 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 50.

The square root of 399356384 is about 19983.9031222632. The cubic root of 399356384 is about 736.4109039802.

The spelling of 399356384 in words is "three hundred ninety-nine million, three hundred fifty-six thousand, three hundred eighty-four".