22545399 has 4 divisors (see below), whose sum is σ = 30060536. Its totient is φ = 15030264.

The previous prime is 22545379. The next prime is 22545407. The reversal of 22545399 is 99354522.

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

It is not a de Polignac number, because 22545399 - 2⁸ = 22545143 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 (22545329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3757564 + ... + 3757569.

It is an arithmetic number, because the mean of its divisors is an integer number (7515134).

Almost surely, 2^22545399 is an apocalyptic number.

22545399 is a deficient number, since it is larger than the sum of its proper divisors (7515137).

22545399 is an equidigital number, since it uses as much as digits as its factorization.

22545399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7515136.

The product of its digits is 97200, while the sum is 39.

The square root of 22545399 is about 4748.1995535150. The cubic root of 22545399 is about 282.5005570772.

The spelling of 22545399 in words is "twenty-two million, five hundred forty-five thousand, three hundred ninety-nine".