1897734969 has 27 divisors (see below), whose sum is σ = 2970911853. Its totient is φ = 1166791392.

The previous prime is 1897734959. The next prime is 1897734977. The reversal of 1897734969 is 9694377981.

The square root of 1897734969 is 43563.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1280709369 + 617025600 = 35787^2 + 24840^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1897734969 is a prime.

It is a super-2 number, since 2×1897734969² = 7202796025130861922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1897734959) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1698399 + ... + 1699515.

Almost surely, 2^1897734969 is an apocalyptic number.

1897734969 is the 43563-rd square number.

1897734969 is the 21782-nd centered octagonal number.

It is an amenable number.

1897734969 is a deficient number, since it is larger than the sum of its proper divisors (1073176884).

1897734969 is an equidigital number, since it uses as much as digits as its factorization.

1897734969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266 (or 1133 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The cubic root of 1897734969 is about 1238.0699616308.

The spelling of 1897734969 in words is "one billion, eight hundred ninety-seven million, seven hundred thirty-four thousand, nine hundred sixty-nine".