23705989 has 2 divisors, whose sum is σ = 23705990. Its totient is φ = 23705988.

The previous prime is 23705987. The next prime is 23706037. The reversal of 23705989 is 98950732.

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., 23357889 + 348100 = 4833^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 23705989 - 2¹ = 23705987 is a prime.

Together with 23705987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23705987) 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, 11852994 + 11852995.

It is an arithmetic number, because the mean of its divisors is an integer number (11852995).

Almost surely, 2^23705989 is an apocalyptic number.

It is an amenable number.

23705989 is a deficient number, since it is larger than the sum of its proper divisors (1).

23705989 is an equidigital number, since it uses as much as digits as its factorization.

23705989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 23705989 is about 4868.8796452572. The cubic root of 23705989 is about 287.2671899773.

The spelling of 23705989 in words is "twenty-three million, seven hundred five thousand, nine hundred eighty-nine".