23423989 has 2 divisors, whose sum is σ = 23423990. Its totient is φ = 23423988.

The previous prime is 23423987. The next prime is 23423993. The reversal of 23423989 is 98932432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21298225 + 2125764 = 4615^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 23423989 - 2¹ = 23423987 is a prime.

Together with 23423987, 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 (23423987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11711994 + 11711995.

It is an arithmetic number, because the mean of its divisors is an integer number (11711995).

Almost surely, 2^23423989 is an apocalyptic number.

It is an amenable number.

23423989 is a deficient number, since it is larger than the sum of its proper divisors (1).

23423989 is an equidigital number, since it uses as much as digits as its factorization.

23423989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 23423989 is about 4839.8335715188. The cubic root of 23423989 is about 286.1235590134.

The spelling of 23423989 in words is "twenty-three million, four hundred twenty-three thousand, nine hundred eighty-nine".