1397977256 has 32 divisors (see below), whose sum is σ = 2849243040. Its totient is φ = 639185088.

The previous prime is 1397977247. The next prime is 1397977313. The reversal of 1397977256 is 6527797931.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51686 + ... + 73941.

It is an arithmetic number, because the mean of its divisors is an integer number (89038845).

Almost surely, 2^1397977256 is an apocalyptic number.

It is an amenable number.

1397977256 is an abundant number, since it is smaller than the sum of its proper divisors (1451265784).

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

1397977256 is a wasteful number, since it uses less digits than its factorization.

1397977256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125753 (or 125749 counting only the distinct ones).

The product of its digits is 5000940, while the sum is 56.

The square root of 1397977256 is about 37389.5340436331. The cubic root of 1397977256 is about 1118.1499154126.

The spelling of 1397977256 in words is "one billion, three hundred ninety-seven million, nine hundred seventy-seven thousand, two hundred fifty-six".