397961577 has 48 divisors (see below), whose sum is σ = 652775760. Its totient is φ = 231888384.

The previous prime is 397961537. The next prime is 397961579. The reversal of 397961577 is 775169793.

397961577 is a `hidden beast` number, since 3 + 9 + 7 + 9 + 61 + 577 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 30702681 + 367258896 = 5541^2 + 19164^2 .

It is not a de Polignac number, because 397961577 - 2⁸ = 397961321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397961579) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 178723 + ... + 180935.

It is an arithmetic number, because the mean of its divisors is an integer number (13599495).

Almost surely, 2^397961577 is an apocalyptic number.

It is an amenable number.

397961577 is a deficient number, since it is larger than the sum of its proper divisors (254814183).

397961577 is a wasteful number, since it uses less digits than its factorization.

397961577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314 (or 2311 counting only the distinct ones).

The product of its digits is 2500470, while the sum is 54.

The square root of 397961577 is about 19948.9743345366. The cubic root of 397961577 is about 735.5525651858.

It can be divided in two parts, 3979 and 61577, that added together give a palindrome (65556).

The spelling of 397961577 in words is "three hundred ninety-seven million, nine hundred sixty-one thousand, five hundred seventy-seven".