22445 has 6 divisors (see below), whose sum is σ = 27342. Its totient is φ = 17688.

The previous prime is 22441. The next prime is 22447. The reversal of 22445 is 54422.

It can be written as a sum of positive squares in only one way, i.e., 17956 + 4489 = 134^2 + 67^2 .

It is not a de Polignac number, because 22445 - 2² = 22441 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 302 + ... + 368.

It is an arithmetic number, because the mean of its divisors is an integer number (4557).

2²²⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

22445 is a deficient number, since it is larger than the sum of its proper divisors (4897).

22445 is an frugal number, since it uses more digits than its factorization.

22445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 72 counting only the distinct ones).

The product of its digits is 320, while the sum is 17.

The square root of 22445 is about 149.8165544925. The cubic root of 22445 is about 28.2080589947.

Multiplying 22445 by its product of digits (320), we get a square (7182400 = 2680²).

Adding to 22445 its reverse (54422), we get a palindrome (76867).

The spelling of 22445 in words is "twenty-two thousand, four hundred forty-five".