23978749 has 2 divisors, whose sum is σ = 23978750. Its totient is φ = 23978748.

The previous prime is 23978711. The next prime is 23978753. The reversal of 23978749 is 94787932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23213124 + 765625 = 4818^2 + 875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23978749 is a prime.

It is a super-3 number, since 3×23978749³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23972749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11989374 + 11989375.

It is an arithmetic number, because the mean of its divisors is an integer number (11989375).

Almost surely, 2^23978749 is an apocalyptic number.

It is an amenable number.

23978749 is a deficient number, since it is larger than the sum of its proper divisors (1).

23978749 is an equidigital number, since it uses as much as digits as its factorization.

23978749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 23978749 is about 4896.8100841262. The cubic root of 23978749 is about 288.3647521274.

The spelling of 23978749 in words is "twenty-three million, nine hundred seventy-eight thousand, seven hundred forty-nine".