397517899 has 12 divisors (see below), whose sum is σ = 411688200. Its totient is φ = 383807808.

The previous prime is 397517893. The next prime is 397517909. The reversal of 397517899 is 998715793.

It is a happy number.

It is not a de Polignac number, because 397517899 - 2²⁷ = 263300171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397517893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189247 + ... + 191335.

It is an arithmetic number, because the mean of its divisors is an integer number (34307350).

Almost surely, 2^397517899 is an apocalyptic number.

397517899 is a deficient number, since it is larger than the sum of its proper divisors (14170301).

397517899 is a wasteful number, since it uses less digits than its factorization.

397517899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302 (or 2265 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 58.

The square root of 397517899 is about 19937.8509122724. The cubic root of 397517899 is about 735.2791134553.

The spelling of 397517899 in words is "three hundred ninety-seven million, five hundred seventeen thousand, eight hundred ninety-nine".