391723264 has 27 divisors (see below), whose sum is σ = 782548977. Its totient is φ = 195703296.

The previous prime is 391723261. The next prime is 391723289. The reversal of 391723264 is 462327193.

The square root of 391723264 is 19792.

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., 295840000 + 95883264 = 17200^2 + 9792^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391723261) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 316054 + ... + 317290.

Almost surely, 2^391723264 is an apocalyptic number.

391723264 is the 19792-nd square number.

It is an amenable number.

391723264 is a deficient number, since it is larger than the sum of its proper divisors (390825713).

391723264 is an frugal number, since it uses more digits than its factorization.

391723264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490 (or 1239 counting only the distinct ones).

The product of its digits is 54432, while the sum is 37.

The cubic root of 391723264 is about 731.6888800968.

It can be divided in two parts, 39172 and 3264, that added together give a square (42436 = 206²).

The spelling of 391723264 in words is "three hundred ninety-one million, seven hundred twenty-three thousand, two hundred sixty-four".