397397775 has 24 divisors (see below), whose sum is σ = 664957440. Its totient is φ = 209388640.

The previous prime is 397397747. The next prime is 397397779. The reversal of 397397775 is 577793793.

It is not a de Polignac number, because 397397775 - 2⁵ = 397397743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397397779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25695 + ... + 38144.

It is an arithmetic number, because the mean of its divisors is an integer number (27706560).

Almost surely, 2^397397775 is an apocalyptic number.

397397775 is a deficient number, since it is larger than the sum of its proper divisors (267559665).

397397775 is a wasteful number, since it uses less digits than its factorization.

397397775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63935 (or 63930 counting only the distinct ones).

The product of its digits is 8751645, while the sum is 57.

The square root of 397397775 is about 19934.8382235723. The cubic root of 397397775 is about 735.2050425211.

The spelling of 397397775 in words is "three hundred ninety-seven million, three hundred ninety-seven thousand, seven hundred seventy-five".