23209973 has 2 divisors, whose sum is σ = 23209974. Its totient is φ = 23209972.

The previous prime is 23209931. The next prime is 23209993. The reversal of 23209973 is 37990232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22829284 + 380689 = 4778^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 23209973 - 2⁶ = 23209909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23209903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11604986 + 11604987.

It is an arithmetic number, because the mean of its divisors is an integer number (11604987).

Almost surely, 2^23209973 is an apocalyptic number.

It is an amenable number.

23209973 is a deficient number, since it is larger than the sum of its proper divisors (1).

23209973 is an equidigital number, since it uses as much as digits as its factorization.

23209973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 23209973 is about 4817.6729859965. The cubic root of 23209973 is about 285.2494911840.

The spelling of 23209973 in words is "twenty-three million, two hundred nine thousand, nine hundred seventy-three".