12918239 has 8 divisors (see below), whose sum is σ = 13321392. Its totient is φ = 12519360.

The previous prime is 12918229. The next prime is 12918259. The reversal of 12918239 is 93281921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12918239 is a prime.

It is a super-2 number, since 2×12918239² = 333761797722242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12918199 and 12918208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12918209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5717 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (1665174).

Almost surely, 2^12918239 is an apocalyptic number.

12918239 is a deficient number, since it is larger than the sum of its proper divisors (403153).

12918239 is a wasteful number, since it uses less digits than its factorization.

12918239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137.

The product of its digits is 7776, while the sum is 35.

The square root of 12918239 is about 3594.1951811219. The cubic root of 12918239 is about 234.6394894796.

The spelling of 12918239 in words is "twelve million, nine hundred eighteen thousand, two hundred thirty-nine".