22018639 has 2 divisors, whose sum is σ = 22018640. Its totient is φ = 22018638.

The previous prime is 22018637. The next prime is 22018673. The reversal of 22018639 is 93681022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22018639 - 2¹ = 22018637 is a prime.

Together with 22018637, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 22018639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22018631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11009319 + 11009320.

It is an arithmetic number, because the mean of its divisors is an integer number (11009320).

Almost surely, 2^22018639 is an apocalyptic number.

22018639 is a deficient number, since it is larger than the sum of its proper divisors (1).

22018639 is an equidigital number, since it uses as much as digits as its factorization.

22018639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 22018639 is about 4692.4022632336. The cubic root of 22018639 is about 280.2830428664.

The spelling of 22018639 in words is "twenty-two million, eighteen thousand, six hundred thirty-nine".