22145623 has 4 divisors (see below), whose sum is σ = 22508728. Its totient is φ = 21782520.

The previous prime is 22145609. The next prime is 22145653. The reversal of 22145623 is 32654122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22145623 - 2⁹ = 22145111 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 (22145653) 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, 181461 + ... + 181582.

It is an arithmetic number, because the mean of its divisors is an integer number (5627182).

Almost surely, 2^22145623 is an apocalyptic number.

22145623 is a deficient number, since it is larger than the sum of its proper divisors (363105).

22145623 is an equidigital number, since it uses as much as digits as its factorization.

22145623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363104.

The product of its digits is 2880, while the sum is 25.

The square root of 22145623 is about 4705.9136201167. The cubic root of 22145623 is about 280.8208184647.

Adding to 22145623 its reverse (32654122), we get a palindrome (54799745).

The spelling of 22145623 in words is "twenty-two million, one hundred forty-five thousand, six hundred twenty-three".