12839691 has 4 divisors (see below), whose sum is σ = 17119592. Its totient is φ = 8559792.

The previous prime is 12839689. The next prime is 12839693. The reversal of 12839691 is 19693821.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12839689) and next prime (12839693).

It is not a de Polignac number, because 12839691 - 2¹ = 12839689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12839693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139946 + ... + 2139951.

It is an arithmetic number, because the mean of its divisors is an integer number (4279898).

Almost surely, 2^12839691 is an apocalyptic number.

12839691 is a deficient number, since it is larger than the sum of its proper divisors (4279901).

12839691 is an equidigital number, since it uses as much as digits as its factorization.

12839691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279900.

The product of its digits is 23328, while the sum is 39.

The square root of 12839691 is about 3583.2514564289. The cubic root of 12839691 is about 234.1629553805.

It can be divided in two parts, 12839 and 691, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 12839691 in words is "twelve million, eight hundred thirty-nine thousand, six hundred ninety-one".