22138573 has 4 divisors (see below), whose sum is σ = 23440860. Its totient is φ = 20836288.

The previous prime is 22138559. The next prime is 22138579. The reversal of 22138573 is 37583122.

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 19954089 + 2184484 = 4467^2 + 1478^2 .

It is not a de Polignac number, because 22138573 - 2¹⁷ = 22007501 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22138579) 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, 651118 + ... + 651151.

It is an arithmetic number, because the mean of its divisors is an integer number (5860215).

Almost surely, 2^22138573 is an apocalyptic number.

It is an amenable number.

22138573 is a deficient number, since it is larger than the sum of its proper divisors (1302287).

22138573 is a wasteful number, since it uses less digits than its factorization.

22138573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302286.

The product of its digits is 10080, while the sum is 31.

The square root of 22138573 is about 4705.1645029691. The cubic root of 22138573 is about 280.7910157825.

The spelling of 22138573 in words is "twenty-two million, one hundred thirty-eight thousand, five hundred seventy-three".