399529320 has 64 divisors (see below), whose sum is σ = 1250709120. Its totient is φ = 101908224.

The previous prime is 399529313. The next prime is 399529327. The reversal of 399529320 is 23925993.

It is an interprime number because it is at equal distance from previous prime (399529313) and next prime (399529327).

It is not an unprimeable number, because it can be changed into a prime (399529327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69619 + ... + 75138.

It is an arithmetic number, because the mean of its divisors is an integer number (19542330).

Almost surely, 2^399529320 is an apocalyptic number.

399529320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399529320 is an abundant number, since it is smaller than the sum of its proper divisors (851179800).

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

399529320 is a wasteful number, since it uses less digits than its factorization.

399529320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144794 (or 144790 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 399529320 is about 19988.2295364047. The cubic root of 399529320 is about 736.5171863075.

The spelling of 399529320 in words is "three hundred ninety-nine million, five hundred twenty-nine thousand, three hundred twenty".