22398557 has 2 divisors, whose sum is σ = 22398558. Its totient is φ = 22398556.

The previous prime is 22398547. The next prime is 22398559. The reversal of 22398557 is 75589322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15952036 + 6446521 = 3994^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 22398557 - 2¹⁰ = 22397533 is a prime.

Together with 22398559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22398559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11199278 + 11199279.

It is an arithmetic number, because the mean of its divisors is an integer number (11199279).

Almost surely, 2^22398557 is an apocalyptic number.

It is an amenable number.

22398557 is a deficient number, since it is larger than the sum of its proper divisors (1).

22398557 is an equidigital number, since it uses as much as digits as its factorization.

22398557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 22398557 is about 4732.7113793258. The cubic root of 22398557 is about 281.8858960264.

The spelling of 22398557 in words is "twenty-two million, three hundred ninety-eight thousand, five hundred fifty-seven".