12422639 has 4 divisors (see below), whose sum is σ = 12758424. Its totient is φ = 12086856.

The previous prime is 12422633. The next prime is 12422647. The reversal of 12422639 is 93622421.

12422639 = 278² + 279² + ... + 388².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93622421 = 113 ⋅828517.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12422639 is a prime.

It is a super-3 number, since 3×12422639³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12422633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167837 + ... + 167910.

It is an arithmetic number, because the mean of its divisors is an integer number (3189606).

Almost surely, 2^12422639 is an apocalyptic number.

12422639 is a deficient number, since it is larger than the sum of its proper divisors (335785).

12422639 is an equidigital number, since it uses as much as digits as its factorization.

12422639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335784.

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

The square root of 12422639 is about 3524.5764284521. The cubic root of 12422639 is about 231.5996799810.

The spelling of 12422639 in words is "twelve million, four hundred twenty-two thousand, six hundred thirty-nine".