18722723 has 2 divisors, whose sum is σ = 18722724. Its totient is φ = 18722722.

The previous prime is 18722699. The next prime is 18722731. The reversal of 18722723 is 32722781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18722723 - 2⁶ = 18722659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18722723.

It is not a weakly prime, because it can be changed into another prime (18722783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9361361 + 9361362.

It is an arithmetic number, because the mean of its divisors is an integer number (9361362).

Almost surely, 2^18722723 is an apocalyptic number.

18722723 is a deficient number, since it is larger than the sum of its proper divisors (1).

18722723 is an equidigital number, since it uses as much as digits as its factorization.

18722723 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18722723 is about 4326.9761959133. The cubic root of 18722723 is about 265.5357524945.

The spelling of 18722723 in words is "eighteen million, seven hundred twenty-two thousand, seven hundred twenty-three".