18240023 has 2 divisors, whose sum is σ = 18240024. Its totient is φ = 18240022.

The previous prime is 18240007. The next prime is 18240029. The reversal of 18240023 is 32004281.

It is a strong prime.

It is an emirp because it is prime and its reverse (32004281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18240023 - 2⁴ = 18240007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18239977 and 18240004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18240029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120011 + 9120012.

It is an arithmetic number, because the mean of its divisors is an integer number (9120012).

Almost surely, 2^18240023 is an apocalyptic number.

18240023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240023 is an equidigital number, since it uses as much as digits as its factorization.

18240023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 18240023 is about 4270.8339934959. The cubic root of 18240023 is about 263.2338852525.

The spelling of 18240023 in words is "eighteen million, two hundred forty thousand, twenty-three".