1397871256 has 16 divisors (see below), whose sum is σ = 2628932040. Its totient is φ = 696822720.

The previous prime is 1397871239. The next prime is 1397871269. The reversal of 1397871256 is 6521787931.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261301 + ... + 266596.

Almost surely, 2^1397871256 is an apocalyptic number.

It is an amenable number.

1397871256 is a deficient number, since it is larger than the sum of its proper divisors (1231060784).

1397871256 is a wasteful number, since it uses less digits than its factorization.

1397871256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528234 (or 528230 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The square root of 1397871256 is about 37388.1165077889. The cubic root of 1397871256 is about 1118.1216538926.

The spelling of 1397871256 in words is "one billion, three hundred ninety-seven million, eight hundred seventy-one thousand, two hundred fifty-six".