397312979 has 8 divisors (see below), whose sum is σ = 455159040. Its totient is φ = 339738696.

The previous prime is 397312973. The next prime is 397312987. The reversal of 397312979 is 979213793.

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

It is a cyclic number.

It is not a de Polignac number, because 397312979 - 2¹² = 397308883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397312973) 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 7 ways as a sum of consecutive naturals, for example, 64799 + ... + 70664.

It is an arithmetic number, because the mean of its divisors is an integer number (56894880).

Almost surely, 2^397312979 is an apocalyptic number.

397312979 is a deficient number, since it is larger than the sum of its proper divisors (57846061).

397312979 is a wasteful number, since it uses less digits than its factorization.

397312979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135889.

The product of its digits is 642978, while the sum is 50.

The square root of 397312979 is about 19932.7112807064. The cubic root of 397312979 is about 735.1527465719.

The spelling of 397312979 in words is "three hundred ninety-seven million, three hundred twelve thousand, nine hundred seventy-nine".