397991679 has 16 divisors (see below), whose sum is σ = 554625120. Its totient is φ = 253532160.

The previous prime is 397991677. The next prime is 397991719. The reversal of 397991679 is 976199793.

It is not a de Polignac number, because 397991679 - 2¹ = 397991677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397991677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15142 + ... + 32019.

It is an arithmetic number, because the mean of its divisors is an integer number (34664070).

Almost surely, 2^397991679 is an apocalyptic number.

397991679 is a deficient number, since it is larger than the sum of its proper divisors (156633441).

397991679 is a wasteful number, since it uses less digits than its factorization.

397991679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47290.

The product of its digits is 5786802, while the sum is 60.

The square root of 397991679 is about 19949.7287951491. The cubic root of 397991679 is about 735.5711105650.

The spelling of 397991679 in words is "three hundred ninety-seven million, nine hundred ninety-one thousand, six hundred seventy-nine".