22538709 has 16 divisors (see below), whose sum is σ = 34103040. Its totient is φ = 14705280.

The previous prime is 22538701. The next prime is 22538717. The reversal of 22538709 is 90783522.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22538701) and next prime (22538717).

It is not a de Polignac number, because 22538709 - 2³ = 22538701 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22538701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7612 + ... + 10149.

It is an arithmetic number, because the mean of its divisors is an integer number (2131440).

Almost surely, 2^22538709 is an apocalyptic number.

22538709 is the 2538-th nonagonal number.

It is an amenable number.

22538709 is a deficient number, since it is larger than the sum of its proper divisors (11564331).

22538709 is a wasteful number, since it uses less digits than its factorization.

22538709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17817 (or 17811 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 22538709 is about 4747.4950236941. The cubic root of 22538709 is about 282.4726117495.

The spelling of 22538709 in words is "twenty-two million, five hundred thirty-eight thousand, seven hundred nine".