12880921 has 9 divisors (see below), whose sum is σ = 13376349. Its totient is φ = 12403584.

The previous prime is 12880919. The next prime is 12880927. The reversal of 12880921 is 12908821.

It is a happy number.

The square root of 12880921 is 3589.

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 1990921 + 10890000 = 1411^2 + 3300^2 .

It is not a de Polignac number, because 12880921 - 2¹ = 12880919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12880927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 132745 + ... + 132841.

It is an arithmetic number, because the mean of its divisors is an integer number (1486261).

Almost surely, 2^12880921 is an apocalyptic number.

12880921 is the 3589-th square number.

12880921 is the 1795-th centered octagonal number.

It is an amenable number.

12880921 is a deficient number, since it is larger than the sum of its proper divisors (495428).

12880921 is an frugal number, since it uses more digits than its factorization.

12880921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The cubic root of 12880921 is about 234.4133306435.

Multiplying 12880921 by its product of nonzero digits (2304), we get a square (29677641984 = 172272²).

The spelling of 12880921 in words is "twelve million, eight hundred eighty thousand, nine hundred twenty-one".