23840281 has 2 divisors, whose sum is σ = 23840282. Its totient is φ = 23840280.

The previous prime is 23840279. The next prime is 23840303. The reversal of 23840281 is 18204832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23609881 + 230400 = 4859^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 23840281 - 2¹ = 23840279 is a prime.

It is a super-2 number, since 2×23840281² = 1136717996317922, which contains 22 as substring.

Together with 23840279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23840251) 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, 11920140 + 11920141.

It is an arithmetic number, because the mean of its divisors is an integer number (11920141).

Almost surely, 2^23840281 is an apocalyptic number.

It is an amenable number.

23840281 is a deficient number, since it is larger than the sum of its proper divisors (1).

23840281 is an equidigital number, since it uses as much as digits as its factorization.

23840281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 23840281 is about 4882.6510217299. The cubic root of 23840281 is about 287.8086152919.

The spelling of 23840281 in words is "twenty-three million, eight hundred forty thousand, two hundred eighty-one".