397391860 has 12 divisors (see below), whose sum is σ = 834522948. Its totient is φ = 158956736.

The previous prime is 397391857. The next prime is 397391867. The reversal of 397391860 is 68193793.

It can be written as a sum of positive squares in 2 ways, for example, as 125933284 + 271458576 = 11222^2 + 16476^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 397391860.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397391867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9934777 + ... + 9934816.

It is an arithmetic number, because the mean of its divisors is an integer number (69543579).

Almost surely, 2^397391860 is an apocalyptic number.

It is an amenable number.

397391860 is an abundant number, since it is smaller than the sum of its proper divisors (437131088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397391860 is a wasteful number, since it uses less digits than its factorization.

397391860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19869602 (or 19869600 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 397391860 is about 19934.6898646555. The cubic root of 397391860 is about 735.2013948246.

The spelling of 397391860 in words is "three hundred ninety-seven million, three hundred ninety-one thousand, eight hundred sixty".