22440815 has 4 divisors (see below), whose sum is σ = 26928984. Its totient is φ = 17952648.

The previous prime is 22440763. The next prime is 22440841. The reversal of 22440815 is 51804422.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22440815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2244077 + ... + 2244086.

It is an arithmetic number, because the mean of its divisors is an integer number (6732246).

Almost surely, 2^22440815 is an apocalyptic number.

22440815 is a deficient number, since it is larger than the sum of its proper divisors (4488169).

22440815 is an equidigital number, since it uses as much as digits as its factorization.

22440815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488168.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 22440815 is about 4737.1737354672. The cubic root of 22440815 is about 282.0630570054.

The spelling of 22440815 in words is "twenty-two million, four hundred forty thousand, eight hundred fifteen".