18506723 has 2 divisors, whose sum is σ = 18506724. Its totient is φ = 18506722.

The previous prime is 18506717. The next prime is 18506737. The reversal of 18506723 is 32760581.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18506723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18506723.

It is not a weakly prime, because it can be changed into another prime (18506753) 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, 9253361 + 9253362.

It is an arithmetic number, because the mean of its divisors is an integer number (9253362).

Almost surely, 2^18506723 is an apocalyptic number.

18506723 is a deficient number, since it is larger than the sum of its proper divisors (1).

18506723 is an equidigital number, since it uses as much as digits as its factorization.

18506723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 18506723 is about 4301.9440954062. The cubic root of 18506723 is about 264.5106574084.

The spelling of 18506723 in words is "eighteen million, five hundred six thousand, seven hundred twenty-three".