12876509 has 12 divisors (see below), whose sum is σ = 13866876. Its totient is φ = 11950848.

The previous prime is 12876503. The next prime is 12876517. The reversal of 12876509 is 90567821.

It can be written as a sum of positive squares in 2 ways, for example, as 6775609 + 6100900 = 2603^2 + 2470^2 .

It is not a de Polignac number, because 12876509 - 2¹² = 12872413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12876503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18797 + ... + 19469.

It is an arithmetic number, because the mean of its divisors is an integer number (1155573).

Almost surely, 2^12876509 is an apocalyptic number.

12876509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12876509 is a deficient number, since it is larger than the sum of its proper divisors (990367).

12876509 is an equidigital number, since it uses as much as digits as its factorization.

12876509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12876509 is about 3588.3852914647. The cubic root of 12876509 is about 234.3865636724.

The spelling of 12876509 in words is "twelve million, eight hundred seventy-six thousand, five hundred nine".