22644443 has 4 divisors (see below), whose sum is σ = 23629008. Its totient is φ = 21659880.

The previous prime is 22644437. The next prime is 22644451. The reversal of 22644443 is 34444622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34444622 = 2 ⋅17222311.

It is a cyclic number.

It is not a de Polignac number, because 22644443 - 2⁶ = 22644379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22644943) 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, 492248 + ... + 492293.

It is an arithmetic number, because the mean of its divisors is an integer number (5907252).

Almost surely, 2^22644443 is an apocalyptic number.

22644443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

22644443 is a deficient number, since it is larger than the sum of its proper divisors (984565).

22644443 is an equidigital number, since it uses as much as digits as its factorization.

22644443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984564.

The product of its digits is 18432, while the sum is 29.

The square root of 22644443 is about 4758.6177614934. The cubic root of 22644443 is about 282.9136363638.

The spelling of 22644443 in words is "twenty-two million, six hundred forty-four thousand, four hundred forty-three".