397420861 has 8 divisors (see below), whose sum is σ = 406350720. Its totient is φ = 388510848.

The previous prime is 397420813. The next prime is 397420897. The reversal of 397420861 is 168024793.

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

It is a cyclic number.

It is not a de Polignac number, because 397420861 - 2²⁵ = 363866429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397429861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40045 + ... + 48973.

It is an arithmetic number, because the mean of its divisors is an integer number (50793840).

Almost surely, 2^397420861 is an apocalyptic number.

It is an amenable number.

397420861 is a deficient number, since it is larger than the sum of its proper divisors (8929859).

397420861 is an equidigital number, since it uses as much as digits as its factorization.

397420861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9923.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 397420861 is about 19935.4172517156. The cubic root of 397420861 is about 735.2192789830.

The spelling of 397420861 in words is "three hundred ninety-seven million, four hundred twenty thousand, eight hundred sixty-one".