23994781 has 4 divisors (see below), whose sum is σ = 24147772. Its totient is φ = 23841792.

The previous prime is 23994767. The next prime is 23994787. The reversal of 23994781 is 18749932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8265625 + 15729156 = 2875^2 + 3966^2 .

It is a cyclic number.

It is not a de Polignac number, because 23994781 - 2⁷ = 23994653 is a prime.

It is a super-2 number, since 2×23994781² = 1151499030475922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23994787) 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 in 3 ways as a sum of consecutive naturals, for example, 76260 + ... + 76573.

It is an arithmetic number, because the mean of its divisors is an integer number (6036943).

Almost surely, 2^23994781 is an apocalyptic number.

It is an amenable number.

23994781 is a deficient number, since it is larger than the sum of its proper divisors (152991).

23994781 is a wasteful number, since it uses less digits than its factorization.

23994781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152990.

The product of its digits is 108864, while the sum is 43.

The square root of 23994781 is about 4898.4467946483. The cubic root of 23994781 is about 288.4290039332.

The spelling of 23994781 in words is "twenty-three million, nine hundred ninety-four thousand, seven hundred eighty-one".