22782989 has 2 divisors, whose sum is σ = 22782990. Its totient is φ = 22782988.

The previous prime is 22782983. The next prime is 22782997. The reversal of 22782989 is 98928722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22250089 + 532900 = 4717^2 + 730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22782989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22782983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11391494 + 11391495.

It is an arithmetic number, because the mean of its divisors is an integer number (11391495).

Almost surely, 2^22782989 is an apocalyptic number.

It is an amenable number.

22782989 is a deficient number, since it is larger than the sum of its proper divisors (1).

22782989 is an equidigital number, since it uses as much as digits as its factorization.

22782989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 22782989 is about 4773.1529411910. The cubic root of 22782989 is about 283.4894492204.

The spelling of 22782989 in words is "twenty-two million, seven hundred eighty-two thousand, nine hundred eighty-nine".