397963257 has 4 divisors (see below), whose sum is σ = 530617680. Its totient is φ = 265308836.

The previous prime is 397963253. The next prime is 397963271. The reversal of 397963257 is 752369793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 397963257 - 2² = 397963253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397963253) 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, 66327207 + ... + 66327212.

It is an arithmetic number, because the mean of its divisors is an integer number (132654420).

Almost surely, 2^397963257 is an apocalyptic number.

It is an amenable number.

397963257 is a deficient number, since it is larger than the sum of its proper divisors (132654423).

397963257 is a wasteful number, since it uses less digits than its factorization.

397963257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132654422.

The product of its digits is 2143260, while the sum is 51.

The square root of 397963257 is about 19949.0164419201. The cubic root of 397963257 is about 735.5536002326.

The spelling of 397963257 in words is "three hundred ninety-seven million, nine hundred sixty-three thousand, two hundred fifty-seven".