399032272 has 30 divisors (see below), whose sum is σ = 794988614. Its totient is φ = 193887360.

The previous prime is 399032233. The next prime is 399032273. The reversal of 399032272 is 272230993.

It can be written as a sum of positive squares in 3 ways, for example, as 56190016 + 342842256 = 7496^2 + 18516^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399032273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 485622 + ... + 486442.

Almost surely, 2^399032272 is an apocalyptic number.

It is an amenable number.

399032272 is a deficient number, since it is larger than the sum of its proper divisors (395956342).

399032272 is an frugal number, since it uses more digits than its factorization.

399032272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 399032272 is about 19975.7921494994. The cubic root of 399032272 is about 736.2116298320.

Multiplying 399032272 by its sum of digits (37), we get a square (14764194064 = 121508²).

399032272 divided by its sum of digits (37) gives a square (10784656 = 3284²).

The spelling of 399032272 in words is "three hundred ninety-nine million, thirty-two thousand, two hundred seventy-two".