397647879 has 4 divisors (see below), whose sum is σ = 530197176. Its totient is φ = 265098584.

The previous prime is 397647869. The next prime is 397647893. The reversal of 397647879 is 978746793.

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

It is a cyclic number.

It is not a de Polignac number, because 397647879 - 2¹² = 397643783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397647869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66274644 + ... + 66274649.

It is an arithmetic number, because the mean of its divisors is an integer number (132549294).

Almost surely, 2^397647879 is an apocalyptic number.

397647879 is a deficient number, since it is larger than the sum of its proper divisors (132549297).

397647879 is a wasteful number, since it uses less digits than its factorization.

397647879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132549296.

The product of its digits is 16003008, while the sum is 60.

The square root of 397647879 is about 19941.1102750073. The cubic root of 397647879 is about 735.3592449955.

The spelling of 397647879 in words is "three hundred ninety-seven million, six hundred forty-seven thousand, eight hundred seventy-nine".