23947691 has 2 divisors, whose sum is σ = 23947692. Its totient is φ = 23947690.

The previous prime is 23947643. The next prime is 23947699. The reversal of 23947691 is 19674932.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23947691 is a prime.

It is not a weakly prime, because it can be changed into another prime (23947699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11973845 + 11973846.

It is an arithmetic number, because the mean of its divisors is an integer number (11973846).

Almost surely, 2^23947691 is an apocalyptic number.

23947691 is a deficient number, since it is larger than the sum of its proper divisors (1).

23947691 is an equidigital number, since it uses as much as digits as its factorization.

23947691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 23947691 is about 4893.6378084202. The cubic root of 23947691 is about 288.2401987577.

The spelling of 23947691 in words is "twenty-three million, nine hundred forty-seven thousand, six hundred ninety-one".