397658771 has 4 divisors (see below), whose sum is σ = 418588200. Its totient is φ = 376729344.

The previous prime is 397658749. The next prime is 397658777. The reversal of 397658771 is 177856793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397658771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397658777) 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 3 ways as a sum of consecutive naturals, for example, 10464686 + ... + 10464723.

It is an arithmetic number, because the mean of its divisors is an integer number (104647050).

Almost surely, 2^397658771 is an apocalyptic number.

397658771 is a deficient number, since it is larger than the sum of its proper divisors (20929429).

397658771 is a wasteful number, since it uses less digits than its factorization.

397658771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20929428.

The product of its digits is 2222640, while the sum is 53.

The square root of 397658771 is about 19941.3833772885. The cubic root of 397658771 is about 735.3659590258.

The spelling of 397658771 in words is "three hundred ninety-seven million, six hundred fifty-eight thousand, seven hundred seventy-one".