397697817 has 16 divisors (see below), whose sum is σ = 580681728. Its totient is φ = 240107280.

The previous prime is 397697803. The next prime is 397697843. The reversal of 397697817 is 718796793.

It is not a de Polignac number, because 397697817 - 2⁴ = 397697801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397697617) 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, 14233 + ... + 31590.

It is an arithmetic number, because the mean of its divisors is an integer number (36292608).

Almost surely, 2^397697817 is an apocalyptic number.

It is an amenable number.

397697817 is a deficient number, since it is larger than the sum of its proper divisors (182983911).

397697817 is a wasteful number, since it uses less digits than its factorization.

397697817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46100.

The product of its digits is 4000752, while the sum is 57.

The square root of 397697817 is about 19942.3623725977. The cubic root of 397697817 is about 735.3900266952.

It can be divided in two parts, 39769 and 7817, that added together give a triangular number (47586 = T₃₀₈).

The spelling of 397697817 in words is "three hundred ninety-seven million, six hundred ninety-seven thousand, eight hundred seventeen".