22279865 has 4 divisors (see below), whose sum is σ = 26735844. Its totient is φ = 17823888.

The previous prime is 22279853. The next prime is 22279867. The reversal of 22279865 is 56897222.

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 15618304 + 6661561 = 3952^2 + 2581^2 .

It is a cyclic number.

It is not a de Polignac number, because 22279865 - 2¹² = 22275769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22279867) 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, 2227982 + ... + 2227991.

It is an arithmetic number, because the mean of its divisors is an integer number (6683961).

Almost surely, 2^22279865 is an apocalyptic number.

It is an amenable number.

22279865 is a deficient number, since it is larger than the sum of its proper divisors (4455979).

22279865 is an equidigital number, since it uses as much as digits as its factorization.

22279865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4455978.

The product of its digits is 120960, while the sum is 41.

The square root of 22279865 is about 4720.1551881268. The cubic root of 22279865 is about 281.3871008932.

The spelling of 22279865 in words is "twenty-two million, two hundred seventy-nine thousand, eight hundred sixty-five".