22009618 has 4 divisors (see below), whose sum is σ = 33014430. Its totient is φ = 11004808.

The previous prime is 22009613. The next prime is 22009633. The reversal of 22009618 is 81690022.

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 only one way, i.e., 19210689 + 2798929 = 4383^2 + 1673^2 .

It is not an unprimeable number, because it can be changed into a prime (22009613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5502403 + ... + 5502406.

Almost surely, 2^22009618 is an apocalyptic number.

22009618 is a deficient number, since it is larger than the sum of its proper divisors (11004812).

22009618 is a wasteful number, since it uses less digits than its factorization.

22009618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11004811.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 22009618 is about 4691.4409300342. The cubic root of 22009618 is about 280.2447604714.

The spelling of 22009618 in words is "twenty-two million, nine thousand, six hundred eighteen".