12518639 has 4 divisors (see below), whose sum is σ = 14307024. Its totient is φ = 10730256.

The previous prime is 12518621. The next prime is 12518657. The reversal of 12518639 is 93681521.

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 (12518621) and next prime (12518657).

It is a cyclic number.

It is not a de Polignac number, because 12518639 - 2⁸ = 12518383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12518599 and 12518608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12518609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894182 + ... + 894195.

It is an arithmetic number, because the mean of its divisors is an integer number (3576756).

Almost surely, 2^12518639 is an apocalyptic number.

12518639 is a deficient number, since it is larger than the sum of its proper divisors (1788385).

12518639 is an equidigital number, since it uses as much as digits as its factorization.

12518639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788384.

The product of its digits is 12960, while the sum is 35.

The square root of 12518639 is about 3538.1688766931. The cubic root of 12518639 is about 232.1947371588.

The spelling of 12518639 in words is "twelve million, five hundred eighteen thousand, six hundred thirty-nine".