18747023 has 2 divisors, whose sum is σ = 18747024. Its totient is φ = 18747022.

The previous prime is 18747013. The next prime is 18747037. The reversal of 18747023 is 32074781.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (32074781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18747023 - 2⁴ = 18747007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18747013) 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, 9373511 + 9373512.

It is an arithmetic number, because the mean of its divisors is an integer number (9373512).

Almost surely, 2^18747023 is an apocalyptic number.

18747023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18747023 is an equidigital number, since it uses as much as digits as its factorization.

18747023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 18747023 is about 4329.7832509261. The cubic root of 18747023 is about 265.6505813979.

The spelling of 18747023 in words is "eighteen million, seven hundred forty-seven thousand, twenty-three".