22005989 has 2 divisors, whose sum is σ = 22005990. Its totient is φ = 22005988.

The previous prime is 22005979. The next prime is 22006037. The reversal of 22005989 is 98950022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 1800964 = 4495^2 + 1342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22005989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22005979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11002994 + 11002995.

It is an arithmetic number, because the mean of its divisors is an integer number (11002995).

Almost surely, 2^22005989 is an apocalyptic number.

It is an amenable number.

22005989 is a deficient number, since it is larger than the sum of its proper divisors (1).

22005989 is an equidigital number, since it uses as much as digits as its factorization.

22005989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 22005989 is about 4691.0541459250. The cubic root of 22005989 is about 280.2293571428.

The spelling of 22005989 in words is "twenty-two million, five thousand, nine hundred eighty-nine".