22639009 has 4 divisors (see below), whose sum is σ = 22652820. Its totient is φ = 22625200.

The previous prime is 22638971. The next prime is 22639031. The reversal of 22639009 is 90093622.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4389025 + 18249984 = 2095^2 + 4272^2 .

It is a cyclic number.

It is not a de Polignac number, because 22639009 - 2⁷ = 22638881 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22639609) 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, 4054 + ... + 7855.

It is an arithmetic number, because the mean of its divisors is an integer number (5663205).

Almost surely, 2^22639009 is an apocalyptic number.

It is an amenable number.

22639009 is a deficient number, since it is larger than the sum of its proper divisors (13811).

22639009 is a wasteful number, since it uses less digits than its factorization.

22639009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13810.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 22639009 is about 4758.0467631161. The cubic root of 22639009 is about 282.8910042374.

The spelling of 22639009 in words is "twenty-two million, six hundred thirty-nine thousand, nine".