1272134889 has 21 divisors (see below), whose sum is σ = 1908774759. Its totient is φ = 847447920.

The previous prime is 1272134887. The next prime is 1272134893. The reversal of 1272134889 is 9884312721.

It is a happy number.

The square root of 1272134889 is 35667.

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

It can be written as a sum of positive squares in only one way, i.e., 1177656489 + 94478400 = 34317^2 + 9720^2 .

It is not a de Polignac number, because 1272134889 - 2¹ = 1272134887 is a prime.

It is a super-2 number, since 2×1272134889² = 3236654351622084642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1272134887) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 962349 + ... + 963669.

Almost surely, 2^1272134889 is an apocalyptic number.

1272134889 is the 35667-th square number.

1272134889 is the 17834-th centered octagonal number.

It is an amenable number.

1272134889 is a deficient number, since it is larger than the sum of its proper divisors (636639870).

1272134889 is an frugal number, since it uses more digits than its factorization.

1272134889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660 (or 1324 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The cubic root of 1272134889 is about 1083.5386015034.

It can be divided in two parts, 1272 and 134889, that added together give a square (136161 = 369²).

The spelling of 1272134889 in words is "one billion, two hundred seventy-two million, one hundred thirty-four thousand, eight hundred eighty-nine".