23979209 has 2 divisors, whose sum is σ = 23979210. Its totient is φ = 23979208.

The previous prime is 23979203. The next prime is 23979211. The reversal of 23979209 is 90297932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20839225 + 3139984 = 4565^2 + 1772^2 .

It is a cyclic number.

It is not a de Polignac number, because 23979209 - 2⁸ = 23978953 is a prime.

Together with 23979211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23979203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11989604 + 11989605.

It is an arithmetic number, because the mean of its divisors is an integer number (11989605).

Almost surely, 2^23979209 is an apocalyptic number.

It is an amenable number.

23979209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23979209 is an equidigital number, since it uses as much as digits as its factorization.

23979209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 23979209 is about 4896.8570532536. The cubic root of 23979209 is about 288.3665960787.

The spelling of 23979209 in words is "twenty-three million, nine hundred seventy-nine thousand, two hundred nine".