397519577279449 has 3 divisors (see below), whose sum is σ = 397519597217343. Its totient is φ = 397519557341556.

The previous prime is 397519577279431. The next prime is 397519577279521. The reversal of 397519577279449 is 944972775915793.

The square root of 397519577279449 is 19937893.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 301104224046025 + 96415353233424 = 17352355^2 + 9819132^2 .

It is not a de Polignac number, because 397519577279449 - 2¹⁷ = 397519577148377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397519577279449.

It is not an unprimeable number, because it can be changed into a prime (397519577289449) 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, 9968947 + ... + 29906839.

It is an arithmetic number, because the mean of its divisors is an integer number (132506532405781).

Almost surely, 2^{397519577279449} is an apocalyptic number.

397519577279449 is the 19937893-rd square number.

397519577279449 is the 9968947-th centered octagonal number.

It is an amenable number.

397519577279449 is a deficient number, since it is larger than the sum of its proper divisors (19937894).

397519577279449 is an frugal number, since it uses more digits than its factorization.

397519577279449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39875786 (or 19937893 counting only the distinct ones).

The product of its digits is 37807106400, while the sum is 88.

The spelling of 397519577279449 in words is "three hundred ninety-seven trillion, five hundred nineteen billion, five hundred seventy-seven million, two hundred seventy-nine thousand, four hundred forty-nine".