23978609 has 2 divisors, whose sum is σ = 23978610. Its totient is φ = 23978608.

The previous prime is 23978599. The next prime is 23978611. The reversal of 23978609 is 90687932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13897984 + 10080625 = 3728^2 + 3175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23978609 is a prime.

Together with 23978611, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23978609.

It is not a weakly prime, because it can be changed into another prime (23978659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11989304 + 11989305.

It is an arithmetic number, because the mean of its divisors is an integer number (11989305).

Almost surely, 2^23978609 is an apocalyptic number.

It is an amenable number.

23978609 is a deficient number, since it is larger than the sum of its proper divisors (1).

23978609 is an equidigital number, since it uses as much as digits as its factorization.

23978609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 23978609 is about 4896.7957890849. The cubic root of 23978609 is about 288.3641909201.

The spelling of 23978609 in words is "twenty-three million, nine hundred seventy-eight thousand, six hundred nine".