22391399 has 2 divisors, whose sum is σ = 22391400. Its totient is φ = 22391398.

The previous prime is 22391389. The next prime is 22391407. The reversal of 22391399 is 99319322.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22391399 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 (22391309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11195699 + 11195700.

It is an arithmetic number, because the mean of its divisors is an integer number (11195700).

Almost surely, 2^22391399 is an apocalyptic number.

22391399 is a deficient number, since it is larger than the sum of its proper divisors (1).

22391399 is an equidigital number, since it uses as much as digits as its factorization.

22391399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 38.

The square root of 22391399 is about 4731.9550927709. The cubic root of 22391399 is about 281.8558650111.

The spelling of 22391399 in words is "twenty-two million, three hundred ninety-one thousand, three hundred ninety-nine".