397856 has 12 divisors (see below), whose sum is σ = 783342. Its totient is φ = 198912.

The previous prime is 397849. The next prime is 397867. The reversal of 397856 is 658793.

It can be written as a sum of positive squares in only one way, i.e., 384400 + 13456 = 620^2 + 116^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397856.

It is an unprimeable number.

397856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6185 + ... + 6248.

2³⁹⁷⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

397856 is a deficient number, since it is larger than the sum of its proper divisors (385486).

397856 is a wasteful number, since it uses less digits than its factorization.

397856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12443 (or 12435 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 397856 is about 630.7582738260. The cubic root of 397856 is about 73.5487513427.

The spelling of 397856 in words is "three hundred ninety-seven thousand, eight hundred fifty-six".