397345815 has 24 divisors (see below), whose sum is σ = 718679520. Its totient is φ = 202703424.

The previous prime is 397345813. The next prime is 397345829. The reversal of 397345815 is 518543793.

397345815 is a `hidden beast` number, since 39 + 7 + 34 + 581 + 5 = 666.

It is not a de Polignac number, because 397345815 - 2¹ = 397345813 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397345813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190920 + ... + 192989.

It is an arithmetic number, because the mean of its divisors is an integer number (29944980).

Almost surely, 2^397345815 is an apocalyptic number.

397345815 is a deficient number, since it is larger than the sum of its proper divisors (321333705).

397345815 is a wasteful number, since it uses less digits than its factorization.

397345815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383943 (or 383940 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 397345815 is about 19933.5349348780. The cubic root of 397345815 is about 735.1729982894.

The spelling of 397345815 in words is "three hundred ninety-seven million, three hundred forty-five thousand, eight hundred fifteen".