397856918 has 8 divisors (see below), whose sum is σ = 599004720. Its totient is φ = 198188680.

The previous prime is 397856897. The next prime is 397856929. The reversal of 397856918 is 819658793.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369218 + ... + 370293.

It is an arithmetic number, because the mean of its divisors is an integer number (74875590).

Almost surely, 2^397856918 is an apocalyptic number.

397856918 is a deficient number, since it is larger than the sum of its proper divisors (201147802).

397856918 is a wasteful number, since it uses less digits than its factorization.

397856918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739782.

The product of its digits is 3265920, while the sum is 56.

The square root of 397856918 is about 19946.3509946055. The cubic root of 397856918 is about 735.4880791065.

The spelling of 397856918 in words is "three hundred ninety-seven million, eight hundred fifty-six thousand, nine hundred eighteen".