22815223 has 4 divisors (see below), whose sum is σ = 22846120. Its totient is φ = 22784328.

The previous prime is 22815217. The next prime is 22815227. The reversal of 22815223 is 32251822.

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 22815223 - 2⁹ = 22814711 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 (22815227) 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, 14313 + ... + 15826.

It is an arithmetic number, because the mean of its divisors is an integer number (5711530).

Almost surely, 2^22815223 is an apocalyptic number.

22815223 is a deficient number, since it is larger than the sum of its proper divisors (30897).

22815223 is an equidigital number, since it uses as much as digits as its factorization.

22815223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30896.

The product of its digits is 1920, while the sum is 25.

The square root of 22815223 is about 4776.5283417980. The cubic root of 22815223 is about 283.6230824431.

It can be divided in two parts, 228 and 15223, that added together give a palindrome (15451).

The spelling of 22815223 in words is "twenty-two million, eight hundred fifteen thousand, two hundred twenty-three".