398933718544 has 45 divisors (see below), whose sum is σ = 777142040077. Its totient is φ = 198386802752.

The previous prime is 398933718503. The next prime is 398933718563. The reversal of 398933718544 is 445817339893.

The square root of 398933718544 is 631612.

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., 26247888144 + 372685830400 = 162012^2 + 610480^2 .

It is a super-2 number, since 2×398933718544² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 679614219 + ... + 679614805.

Almost surely, 2^398933718544 is an apocalyptic number.

398933718544 is the 631612-nd square number.

It is an amenable number.

398933718544 is a deficient number, since it is larger than the sum of its proper divisors (378208321533).

398933718544 is an frugal number, since it uses more digits than its factorization.

398933718544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 858 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 64.

Multiplying 398933718544 by its sum of digits (64), we get a square (25531757986816 = 5052896²).

The spelling of 398933718544 in words is "three hundred ninety-eight billion, nine hundred thirty-three million, seven hundred eighteen thousand, five hundred forty-four".