399280324 has 27 divisors (see below), whose sum is σ = 712939437. Its totient is φ = 195663744.

The previous prime is 399280303. The next prime is 399280363. The reversal of 399280324 is 423082993.

The square root of 399280324 is 19982.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 179292100 + 219988224 = 13390^2 + 14832^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3876457 + ... + 3876559.

Almost surely, 2^399280324 is an apocalyptic number.

399280324 is the 19982-nd square number.

It is an amenable number.

399280324 is a deficient number, since it is larger than the sum of its proper divisors (313659113).

399280324 is an equidigital number, since it uses as much as digits as its factorization.

399280324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The cubic root of 399280324 is about 736.3641496091.

The spelling of 399280324 in words is "three hundred ninety-nine million, two hundred eighty thousand, three hundred twenty-four".