12642839 has 4 divisors (see below), whose sum is σ = 13792200. Its totient is φ = 11493480.

The previous prime is 12642827. The next prime is 12642841. The reversal of 12642839 is 93824621.

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 12642839 - 2¹⁶ = 12577303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12642799 and 12642808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12642139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 574664 + ... + 574685.

It is an arithmetic number, because the mean of its divisors is an integer number (3448050).

Almost surely, 2^12642839 is an apocalyptic number.

12642839 is a deficient number, since it is larger than the sum of its proper divisors (1149361).

12642839 is a wasteful number, since it uses less digits than its factorization.

12642839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149360.

The product of its digits is 20736, while the sum is 35.

The square root of 12642839 is about 3555.6770100784. The cubic root of 12642839 is about 232.9600955811.

The spelling of 12642839 in words is "twelve million, six hundred forty-two thousand, eight hundred thirty-nine".