18418723 has 2 divisors, whose sum is σ = 18418724. Its totient is φ = 18418722.

The previous prime is 18418721. The next prime is 18418739. The reversal of 18418723 is 32781481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18418723 - 2¹ = 18418721 is a prime.

Together with 18418721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18418721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209361 + 9209362.

It is an arithmetic number, because the mean of its divisors is an integer number (9209362).

Almost surely, 2^18418723 is an apocalyptic number.

18418723 is a deficient number, since it is larger than the sum of its proper divisors (1).

18418723 is an equidigital number, since it uses as much as digits as its factorization.

18418723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 18418723 is about 4291.7039739479. The cubic root of 18418723 is about 264.0907392019.

The spelling of 18418723 in words is "eighteen million, four hundred eighteen thousand, seven hundred twenty-three".