397863257 has 16 divisors (see below), whose sum is σ = 471992832. Its totient is φ = 331211520.

The previous prime is 397863253. The next prime is 397863283. The reversal of 397863257 is 752368793.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 397863257 - 2² = 397863253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397863253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21833 + ... + 35670.

It is an arithmetic number, because the mean of its divisors is an integer number (29499552).

Almost surely, 2^397863257 is an apocalyptic number.

397863257 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

397863257 is a deficient number, since it is larger than the sum of its proper divisors (74129575).

397863257 is a wasteful number, since it uses less digits than its factorization.

397863257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57568.

The product of its digits is 1905120, while the sum is 50.

The square root of 397863257 is about 19946.5098952173. The cubic root of 397863257 is about 735.4919852295.

The spelling of 397863257 in words is "three hundred ninety-seven million, eight hundred sixty-three thousand, two hundred fifty-seven".