1397877392 has 20 divisors (see below), whose sum is σ = 2714276796. Its totient is φ = 697418880.

The previous prime is 1397877359. The next prime is 1397877413. The reversal of 1397877392 is 2937787931.

It can be written as a sum of positive squares in 2 ways, for example, as 878766736 + 519110656 = 29644^2 + 22784^2 .

It is a super-2 number, since 2×1397877392² = 3908122406129443328, which contains 22 as substring.

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, 87383 + ... + 102134.

Almost surely, 2^1397877392 is an apocalyptic number.

It is an amenable number.

1397877392 is a deficient number, since it is larger than the sum of its proper divisors (1316399404).

1397877392 is a wasteful number, since it uses less digits than its factorization.

1397877392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189986 (or 189980 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 56.

The square root of 1397877392 is about 37388.1985658576. The cubic root of 1397877392 is about 1118.1232899003.

The spelling of 1397877392 in words is "one billion, three hundred ninety-seven million, eight hundred seventy-seven thousand, three hundred ninety-two".