23447891 has 2 divisors, whose sum is σ = 23447892. Its totient is φ = 23447890.

The previous prime is 23447887. The next prime is 23447903. The reversal of 23447891 is 19874432.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23447891 - 2² = 23447887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23447861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11723945 + 11723946.

It is an arithmetic number, because the mean of its divisors is an integer number (11723946).

Almost surely, 2^23447891 is an apocalyptic number.

23447891 is a deficient number, since it is larger than the sum of its proper divisors (1).

23447891 is an equidigital number, since it uses as much as digits as its factorization.

23447891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 23447891 is about 4842.3022417028. The cubic root of 23447891 is about 286.2208467478.

The spelling of 23447891 in words is "twenty-three million, four hundred forty-seven thousand, eight hundred ninety-one".