1397556684 has 18 divisors (see below), whose sum is σ = 3532712820. Its totient is φ = 465852216.

The previous prime is 1397556683. The next prime is 1397556691. The reversal of 1397556684 is 4866557931.

1397556684 is a `hidden beast` number, since 1 + 3 + 9 + 7 + 556 + 6 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1397556684.

It is not an unprimeable number, because it can be changed into a prime (1397556683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19410474 + ... + 19410545.

Almost surely, 2^1397556684 is an apocalyptic number.

It is an amenable number.

1397556684 is an abundant number, since it is smaller than the sum of its proper divisors (2135156136).

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

1397556684 is a wasteful number, since it uses less digits than its factorization.

1397556684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38821029 (or 38821024 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The square root of 1397556684 is about 37383.9094263829. The cubic root of 1397556684 is about 1118.0377748871.

The spelling of 1397556684 in words is "one billion, three hundred ninety-seven million, five hundred fifty-six thousand, six hundred eighty-four".