22639391 has 4 divisors (see below), whose sum is σ = 22739352. Its totient is φ = 22539432.

The previous prime is 22639361. The next prime is 22639399. The reversal of 22639391 is 19393622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19393622 = 2 ⋅9696811.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22639391 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 (22639399) 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, 49640 + ... + 50093.

It is an arithmetic number, because the mean of its divisors is an integer number (5684838).

Almost surely, 2^22639391 is an apocalyptic number.

22639391 is a deficient number, since it is larger than the sum of its proper divisors (99961).

22639391 is an equidigital number, since it uses as much as digits as its factorization.

22639391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99960.

The product of its digits is 17496, while the sum is 35.

The square root of 22639391 is about 4758.0869054695. The cubic root of 22639391 is about 282.8925953518.

The spelling of 22639391 in words is "twenty-two million, six hundred thirty-nine thousand, three hundred ninety-one".