23009947 has 2 divisors, whose sum is σ = 23009948. Its totient is φ = 23009946.

The previous prime is 23009933. The next prime is 23009951. The reversal of 23009947 is 74990032.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23009947 - 2¹¹ = 23007899 is a prime.

It is not a weakly prime, because it can be changed into another prime (23009927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11504973 + 11504974.

It is an arithmetic number, because the mean of its divisors is an integer number (11504974).

Almost surely, 2^23009947 is an apocalyptic number.

23009947 is a deficient number, since it is larger than the sum of its proper divisors (1).

23009947 is an equidigital number, since it uses as much as digits as its factorization.

23009947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 23009947 is about 4796.8684576503. The cubic root of 23009947 is about 284.4276890980.

Adding to 23009947 its reverse (74990032), we get a palindrome (97999979).

The spelling of 23009947 in words is "twenty-three million, nine thousand, nine hundred forty-seven".