397816858 has 8 divisors (see below), whose sum is σ = 604899828. Its totient is φ = 196183584.

The previous prime is 397816849. The next prime is 397816877. The reversal of 397816858 is 858618793.

It can be written as a sum of positive squares in 2 ways, for example, as 396686889 + 1129969 = 19917^2 + 1063^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 397816799 and 397816808.

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, 1362241 + ... + 1362532.

Almost surely, 2^397816858 is an apocalyptic number.

397816858 is a deficient number, since it is larger than the sum of its proper divisors (207082970).

397816858 is a wasteful number, since it uses less digits than its factorization.

397816858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724848.

The product of its digits is 2903040, while the sum is 55.

The square root of 397816858 is about 19945.3467756266. The cubic root of 397816858 is about 735.4633929777.

The spelling of 397816858 in words is "three hundred ninety-seven million, eight hundred sixteen thousand, eight hundred fifty-eight".