22218779 has 16 divisors (see below), whose sum is σ = 25888896. Its totient is φ = 18844800.

The previous prime is 22218767. The next prime is 22218799. The reversal of 22218779 is 97781222.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22218779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22218719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24044 + ... + 24950.

It is an arithmetic number, because the mean of its divisors is an integer number (1618056).

Almost surely, 2^22218779 is an apocalyptic number.

22218779 is a deficient number, since it is larger than the sum of its proper divisors (3670117).

22218779 is a wasteful number, since it uses less digits than its factorization.

22218779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066.

The product of its digits is 28224, while the sum is 38.

The square root of 22218779 is about 4713.6799848950. The cubic root of 22218779 is about 281.1297003867.

The spelling of 22218779 in words is "twenty-two million, two hundred eighteen thousand, seven hundred seventy-nine".