22918909 has 4 divisors (see below), whose sum is σ = 24681916. Its totient is φ = 21155904.

The previous prime is 22918901. The next prime is 22918933. The reversal of 22918909 is 90981922.

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 5654884 + 17264025 = 2378^2 + 4155^2 .

It is a cyclic number.

It is not a de Polignac number, because 22918909 - 2³ = 22918901 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 (22918901) 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, 881484 + ... + 881509.

It is an arithmetic number, because the mean of its divisors is an integer number (6170479).

Almost surely, 2^22918909 is an apocalyptic number.

It is an amenable number.

22918909 is a deficient number, since it is larger than the sum of its proper divisors (1763007).

22918909 is a wasteful number, since it uses less digits than its factorization.

22918909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763006.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 22918909 is about 4787.3697371312. The cubic root of 22918909 is about 284.0520841127.

The spelling of 22918909 in words is "twenty-two million, nine hundred eighteen thousand, nine hundred nine".