22640173 has 4 divisors (see below), whose sum is σ = 22652028. Its totient is φ = 22628320.

The previous prime is 22640131. The next prime is 22640179. The reversal of 22640173 is 37104622.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 37104622 = 2 ⋅18552311.

It can be written as a sum of positive squares in 2 ways, for example, as 7171684 + 15468489 = 2678^2 + 3933^2 .

It is a cyclic number.

It is not a de Polignac number, because 22640173 - 2¹⁷ = 22509101 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 (22640179) 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, 2338 + ... + 7123.

It is an arithmetic number, because the mean of its divisors is an integer number (5663007).

Almost surely, 2^22640173 is an apocalyptic number.

It is an amenable number.

22640173 is a deficient number, since it is larger than the sum of its proper divisors (11855).

22640173 is an equidigital number, since it uses as much as digits as its factorization.

22640173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11854.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 22640173 is about 4758.1690806444. The cubic root of 22640173 is about 282.8958524986.

Adding to 22640173 its reverse (37104622), we get a palindrome (59744795).

The spelling of 22640173 in words is "twenty-two million, six hundred forty thousand, one hundred seventy-three".