22065639 has 4 divisors (see below), whose sum is σ = 29420856. Its totient is φ = 14710424.

The previous prime is 22065629. The next prime is 22065689. The reversal of 22065639 is 93656022.

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 22065639 - 2¹⁶ = 22000103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22065619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3677604 + ... + 3677609.

It is an arithmetic number, because the mean of its divisors is an integer number (7355214).

Almost surely, 2^22065639 is an apocalyptic number.

22065639 is a deficient number, since it is larger than the sum of its proper divisors (7355217).

22065639 is an equidigital number, since it uses as much as digits as its factorization.

22065639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7355216.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 22065639 is about 4697.4076893538. The cubic root of 22065639 is about 280.4823276794.

The spelling of 22065639 in words is "twenty-two million, sixty-five thousand, six hundred thirty-nine".