1397969568 has 72 divisors (see below), whose sum is σ = 4209342228. Its totient is φ = 438577152.

The previous prime is 1397969567. The next prime is 1397969591. The reversal of 1397969568 is 8659697931.

1397969568 is a `hidden beast` number, since 1 + 3 + 9 + 7 + 9 + 69 + 568 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1112089104 + 285880464 = 33348^2 + 16908^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-3 number, since 3×1397969568³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1397969567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137871 + ... + 147662.

Almost surely, 2^1397969568 is an apocalyptic number.

1397969568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1397969568 is an abundant number, since it is smaller than the sum of its proper divisors (2811372660).

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

1397969568 is a wasteful number, since it uses less digits than its factorization.

1397969568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285566 (or 285555 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The square root of 1397969568 is about 37389.4312339731. The cubic root of 1397969568 is about 1118.1478657006.

The spelling of 1397969568 in words is "one billion, three hundred ninety-seven million, nine hundred sixty-nine thousand, five hundred sixty-eight".