22218965 has 4 divisors (see below), whose sum is σ = 26662764. Its totient is φ = 17775168.

The previous prime is 22218941. The next prime is 22218997. The reversal of 22218965 is 56981222.

It is a happy number.

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 2380849 + 19838116 = 1543^2 + 4454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22218965 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221892 + ... + 2221901.

It is an arithmetic number, because the mean of its divisors is an integer number (6665691).

Almost surely, 2^22218965 is an apocalyptic number.

It is an amenable number.

22218965 is a deficient number, since it is larger than the sum of its proper divisors (4443799).

22218965 is an equidigital number, since it uses as much as digits as its factorization.

22218965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443798.

The product of its digits is 17280, while the sum is 35.

The square root of 22218965 is about 4713.6997146615. The cubic root of 22218965 is about 281.1304848580.

The spelling of 22218965 in words is "twenty-two million, two hundred eighteen thousand, nine hundred sixty-five".