397520979 has 8 divisors (see below), whose sum is σ = 561206160. Its totient is φ = 249424896.

The previous prime is 397520927. The next prime is 397521001. The reversal of 397520979 is 979025793.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397520979 - 2¹⁷ = 397389907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 7794529 = 397520979 / (3 + 9 + 7 + 5 + 2 + 0 + 9 + 7 + 9).

It is not an unprimeable number, because it can be changed into a prime (397520909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3897214 + ... + 3897315.

It is an arithmetic number, because the mean of its divisors is an integer number (70150770).

Almost surely, 2^397520979 is an apocalyptic number.

397520979 is a deficient number, since it is larger than the sum of its proper divisors (163685181).

397520979 is a wasteful number, since it uses less digits than its factorization.

397520979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7794549.

The product of its (nonzero) digits is 1071630, while the sum is 51.

The square root of 397520979 is about 19937.9281521426. The cubic root of 397520979 is about 735.2810124506.

The spelling of 397520979 in words is "three hundred ninety-seven million, five hundred twenty thousand, nine hundred seventy-nine".