22218749 has 8 divisors (see below), whose sum is σ = 25426560. Its totient is φ = 19019376.

The previous prime is 22218743. The next prime is 22218767. The reversal of 22218749 is 94781222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22218749 - 2¹² = 22214653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22218743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5267 + ... + 8495.

It is an arithmetic number, because the mean of its divisors is an integer number (3178320).

Almost surely, 2^22218749 is an apocalyptic number.

It is an amenable number.

22218749 is a deficient number, since it is larger than the sum of its proper divisors (3207811).

22218749 is an equidigital number, since it uses as much as digits as its factorization.

22218749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4219.

The product of its digits is 16128, while the sum is 35.

The square root of 22218749 is about 4713.6768026669. The cubic root of 22218749 is about 281.1295738587.

The spelling of 22218749 in words is "twenty-two million, two hundred eighteen thousand, seven hundred forty-nine".