397257838 has 4 divisors (see below), whose sum is σ = 595886760. Its totient is φ = 198628918.

The previous prime is 397257829. The next prime is 397257857. The reversal of 397257838 is 838752793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 838752793 = 103 ⋅8143231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99314458 + ... + 99314461.

It is an arithmetic number, because the mean of its divisors is an integer number (148971690).

Almost surely, 2^397257838 is an apocalyptic number.

397257838 is a deficient number, since it is larger than the sum of its proper divisors (198628922).

397257838 is a wasteful number, since it uses less digits than its factorization.

397257838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198628921.

The product of its digits is 2540160, while the sum is 52.

The square root of 397257838 is about 19931.3280540961. The cubic root of 397257838 is about 735.1187356576.

The spelling of 397257838 in words is "three hundred ninety-seven million, two hundred fifty-seven thousand, eight hundred thirty-eight".