18940723 has 2 divisors, whose sum is σ = 18940724. Its totient is φ = 18940722.

The previous prime is 18940717. The next prime is 18940751. The reversal of 18940723 is 32704981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18940723 is a prime.

It is not a weakly prime, because it can be changed into another prime (18940793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9470361 + 9470362.

It is an arithmetic number, because the mean of its divisors is an integer number (9470362).

Almost surely, 2^18940723 is an apocalyptic number.

18940723 is a deficient number, since it is larger than the sum of its proper divisors (1).

18940723 is an equidigital number, since it uses as much as digits as its factorization.

18940723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 18940723 is about 4352.0940936519. The cubic root of 18940723 is about 266.5623760586.

The spelling of 18940723 in words is "eighteen million, nine hundred forty thousand, seven hundred twenty-three".