22638905 has 4 divisors (see below), whose sum is σ = 27166692. Its totient is φ = 18111120.

The previous prime is 22638881. The next prime is 22638919. The reversal of 22638905 is 50983622.

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 11854249 + 10784656 = 3443^2 + 3284^2 .

It is not a de Polignac number, because 22638905 - 2²⁰ = 21590329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2263886 + ... + 2263895.

It is an arithmetic number, because the mean of its divisors is an integer number (6791673).

Almost surely, 2^22638905 is an apocalyptic number.

It is an amenable number.

22638905 is a deficient number, since it is larger than the sum of its proper divisors (4527787).

22638905 is an equidigital number, since it uses as much as digits as its factorization.

22638905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527786.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 22638905 is about 4758.0358342493. The cubic root of 22638905 is about 282.8905710513.

The spelling of 22638905 in words is "twenty-two million, six hundred thirty-eight thousand, nine hundred five".