12912239 has 4 divisors (see below), whose sum is σ = 12934824. Its totient is φ = 12889656.

The previous prime is 12912233. The next prime is 12912241. The reversal of 12912239 is 93221921.

12912239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12912239 - 2¹² = 12908143 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 (12912233) 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, 10412 + ... + 11585.

It is an arithmetic number, because the mean of its divisors is an integer number (3233706).

Almost surely, 2^12912239 is an apocalyptic number.

12912239 is a deficient number, since it is larger than the sum of its proper divisors (22585).

12912239 is an equidigital number, since it uses as much as digits as its factorization.

12912239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22584.

The product of its digits is 1944, while the sum is 29.

The square root of 12912239 is about 3593.3604049691. The cubic root of 12912239 is about 234.6031570003.

The spelling of 12912239 in words is "twelve million, nine hundred twelve thousand, two hundred thirty-nine".