23967781 has 2 divisors, whose sum is σ = 23967782. Its totient is φ = 23967780.

The previous prime is 23967767. The next prime is 23967799. The reversal of 23967781 is 18776932.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 11115556 = 3585^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 23967781 - 2⁷ = 23967653 is a prime.

It is a super-2 number, since 2×23967781² = 1148909052127922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23967761) 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, 11983890 + 11983891.

It is an arithmetic number, because the mean of its divisors is an integer number (11983891).

Almost surely, 2^23967781 is an apocalyptic number.

It is an amenable number.

23967781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23967781 is an equidigital number, since it uses as much as digits as its factorization.

23967781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 23967781 is about 4895.6900432932. The cubic root of 23967781 is about 288.3207789278.

The spelling of 23967781 in words is "twenty-three million, nine hundred sixty-seven thousand, seven hundred eighty-one".