1397969569 has 4 divisors (see below), whose sum is σ = 1402464960. Its totient is φ = 1393474180.

The previous prime is 1397969567. The next prime is 1397969591. The reversal of 1397969569 is 9659697931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9659697931 = 13 ⋅743053687.

It is a cyclic number.

It is not a de Polignac number, because 1397969569 - 2¹ = 1397969567 is a prime.

It is a super-2 number, since 2×1397969569² = 3908637831700091522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1397969569.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2247229 + ... + 2247850.

It is an arithmetic number, because the mean of its divisors is an integer number (350616240).

Almost surely, 2^1397969569 is an apocalyptic number.

It is an amenable number.

1397969569 is a deficient number, since it is larger than the sum of its proper divisors (4495391).

1397969569 is an equidigital number, since it uses as much as digits as its factorization.

1397969569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495390.

The product of its digits is 24800580, while the sum is 64.

The square root of 1397969569 is about 37389.4312473458. The cubic root of 1397969569 is about 1118.1478659673.

The spelling of 1397969569 in words is "one billion, three hundred ninety-seven million, nine hundred sixty-nine thousand, five hundred sixty-nine".