22397 has 2 divisors, whose sum is σ = 22398. Its totient is φ = 22396.

The previous prime is 22391. The next prime is 22409. The reversal of 22397 is 79322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22201 + 196 = 149^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 22397 - 2⁴ = 22381 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22391) 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, 11198 + 11199.

It is an arithmetic number, because the mean of its divisors is an integer number (11199).

2²²³⁹⁷ is an apocalyptic number.

It is an amenable number.

22397 is a deficient number, since it is larger than the sum of its proper divisors (1).

22397 is an equidigital number, since it uses as much as digits as its factorization.

22397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 23.

The square root of 22397 is about 149.6562728388. The cubic root of 22397 is about 28.1879364259.

The spelling of 22397 in words is "twenty-two thousand, three hundred ninety-seven".