22618397 has 2 divisors, whose sum is σ = 22618398. Its totient is φ = 22618396.

The previous prime is 22618391. The next prime is 22618423. The reversal of 22618397 is 79381622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19882681 + 2735716 = 4459^2 + 1654^2 .

It is a cyclic number.

It is not a de Polignac number, because 22618397 - 2²² = 18424093 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22618397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22618391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11309198 + 11309199.

It is an arithmetic number, because the mean of its divisors is an integer number (11309199).

Almost surely, 2^22618397 is an apocalyptic number.

It is an amenable number.

22618397 is a deficient number, since it is larger than the sum of its proper divisors (1).

22618397 is an equidigital number, since it uses as much as digits as its factorization.

22618397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 22618397 is about 4755.8802550106. The cubic root of 22618397 is about 282.8051241547.

The spelling of 22618397 in words is "twenty-two million, six hundred eighteen thousand, three hundred ninety-seven".