22398749 has 2 divisors, whose sum is σ = 22398750. Its totient is φ = 22398748.

The previous prime is 22398731. The next prime is 22398763. The reversal of 22398749 is 94789322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16662724 + 5736025 = 4082^2 + 2395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22398749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22398799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11199374 + 11199375.

It is an arithmetic number, because the mean of its divisors is an integer number (11199375).

Almost surely, 2^22398749 is an apocalyptic number.

It is an amenable number.

22398749 is a deficient number, since it is larger than the sum of its proper divisors (1).

22398749 is an equidigital number, since it uses as much as digits as its factorization.

22398749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 22398749 is about 4732.7316636378. The cubic root of 22398749 is about 281.8867014642.

The spelling of 22398749 in words is "twenty-two million, three hundred ninety-eight thousand, seven hundred forty-nine".