397856715 has 8 divisors (see below), whose sum is σ = 636570768. Its totient is φ = 212190240.

The previous prime is 397856707. The next prime is 397856731. The reversal of 397856715 is 517658793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397856715 - 2³ = 397856707 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13261876 + ... + 13261905.

It is an arithmetic number, because the mean of its divisors is an integer number (79571346).

Almost surely, 2^397856715 is an apocalyptic number.

397856715 is a deficient number, since it is larger than the sum of its proper divisors (238714053).

397856715 is a wasteful number, since it uses less digits than its factorization.

397856715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26523789.

The product of its digits is 1587600, while the sum is 51.

The square root of 397856715 is about 19946.3459059548. The cubic root of 397856715 is about 735.4879540162.

The spelling of 397856715 in words is "three hundred ninety-seven million, eight hundred fifty-six thousand, seven hundred fifteen".