23890681 has 2 divisors, whose sum is σ = 23890682. Its totient is φ = 23890680.

The previous prime is 23890673. The next prime is 23890717. The reversal of 23890681 is 18609832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15335056 + 8555625 = 3916^2 + 2925^2 .

It is a cyclic number.

It is not a de Polignac number, because 23890681 - 2³ = 23890673 is a prime.

It is a super-2 number, since 2×23890681² = 1141529277287522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23890681.

It is not a weakly prime, because it can be changed into another prime (23890621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11945340 + 11945341.

It is an arithmetic number, because the mean of its divisors is an integer number (11945341).

Almost surely, 2^23890681 is an apocalyptic number.

It is an amenable number.

23890681 is a deficient number, since it is larger than the sum of its proper divisors (1).

23890681 is an equidigital number, since it uses as much as digits as its factorization.

23890681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 23890681 is about 4887.8094275452. The cubic root of 23890681 is about 288.0112882985.

The spelling of 23890681 in words is "twenty-three million, eight hundred ninety thousand, six hundred eighty-one".