1972869889 has 3 divisors (see below), whose sum is σ = 1972914307. Its totient is φ = 1972825472.

The previous prime is 1972869851. The next prime is 1972869893. The reversal of 1972869889 is 9889682791.

The square root of 1972869889 is 44417.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9889682791 = 1601 ⋅6177191.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 1917739264 = 7425^2 + 43792^2 .

It is not a de Polignac number, because 1972869889 - 2⁷ = 1972869761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1972869089) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22209 + ... + 66625.

Almost surely, 2^1972869889 is an apocalyptic number.

1972869889 is the 44417-th square number.

1972869889 is the 22209-th centered octagonal number.

It is an amenable number.

1972869889 is a deficient number, since it is larger than the sum of its proper divisors (44418).

1972869889 is an frugal number, since it uses more digits than its factorization.

1972869889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88834 (or 44417 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 67.

The cubic root of 1972869889 is about 1254.1981277809.

The spelling of 1972869889 in words is "one billion, nine hundred seventy-two million, eight hundred sixty-nine thousand, eight hundred eighty-nine".