12642239 has 4 divisors (see below), whose sum is σ = 13307640. Its totient is φ = 11976840.

The previous prime is 12642211. The next prime is 12642263. The reversal of 12642239 is 93224621.

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

It is not a de Polignac number, because 12642239 - 2⁸ = 12641983 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 (12642299) 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, 332672 + ... + 332709.

It is an arithmetic number, because the mean of its divisors is an integer number (3326910).

Almost surely, 2^12642239 is an apocalyptic number.

12642239 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12642239 is a deficient number, since it is larger than the sum of its proper divisors (665401).

12642239 is an equidigital number, since it uses as much as digits as its factorization.

12642239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665400.

The product of its digits is 5184, while the sum is 29.

The square root of 12642239 is about 3555.5926369594. The cubic root of 12642239 is about 232.9564102730.

The spelling of 12642239 in words is "twelve million, six hundred forty-two thousand, two hundred thirty-nine".