22199965 has 4 divisors (see below), whose sum is σ = 26639964. Its totient is φ = 17759968.

The previous prime is 22199959. The next prime is 22199971. The reversal of 22199965 is 56999122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56999122 = 2 ⋅28499561.

It is an interprime number because it is at equal distance from previous prime (22199959) and next prime (22199971).

It can be written as a sum of positive squares in 2 ways, for example, as 3485689 + 18714276 = 1867^2 + 4326^2 .

It is a cyclic number.

It is not a de Polignac number, because 22199965 - 2¹³ = 22191773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2219992 + ... + 2220001.

It is an arithmetic number, because the mean of its divisors is an integer number (6659991).

Almost surely, 2^22199965 is an apocalyptic number.

It is an amenable number.

22199965 is a deficient number, since it is larger than the sum of its proper divisors (4439999).

22199965 is an equidigital number, since it uses as much as digits as its factorization.

22199965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4439998.

The product of its digits is 87480, while the sum is 43.

The square root of 22199965 is about 4711.6838815863. The cubic root of 22199965 is about 281.0503280718.

The spelling of 22199965 in words is "twenty-two million, one hundred ninety-nine thousand, nine hundred sixty-five".