397689599 has 4 divisors (see below), whose sum is σ = 397777464. Its totient is φ = 397601736.

The previous prime is 397689587. The next prime is 397689631. The reversal of 397689599 is 995986793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 995986793 = 71 ⋅14027983.

It is a cyclic number.

It is not a de Polignac number, because 397689599 - 2²⁰ = 396641023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397689529) 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, 36752 + ... + 46325.

It is an arithmetic number, because the mean of its divisors is an integer number (99444366).

Almost surely, 2^397689599 is an apocalyptic number.

397689599 is a deficient number, since it is larger than the sum of its proper divisors (87865).

397689599 is an equidigital number, since it uses as much as digits as its factorization.

397689599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87864.

The product of its digits is 33067440, while the sum is 65.

The square root of 397689599 is about 19942.1563277395. The cubic root of 397689599 is about 735.3849613109.

The spelling of 397689599 in words is "three hundred ninety-seven million, six hundred eighty-nine thousand, five hundred ninety-nine".