22638289 has 2 divisors, whose sum is σ = 22638290. Its totient is φ = 22638288.

The previous prime is 22638283. The next prime is 22638323. The reversal of 22638289 is 98283622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22137025 + 501264 = 4705^2 + 708^2 .

It is a cyclic number.

It is not a de Polignac number, because 22638289 - 2³ = 22638281 is a prime.

It is not a weakly prime, because it can be changed into another prime (22638281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11319144 + 11319145.

It is an arithmetic number, because the mean of its divisors is an integer number (11319145).

Almost surely, 2^22638289 is an apocalyptic number.

It is an amenable number.

22638289 is a deficient number, since it is larger than the sum of its proper divisors (1).

22638289 is an equidigital number, since it uses as much as digits as its factorization.

22638289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 22638289 is about 4757.9711012153. The cubic root of 22638289 is about 282.8880052298. Note that the first 3 decimals are identical.

The spelling of 22638289 in words is "twenty-two million, six hundred thirty-eight thousand, two hundred eighty-nine".