18740723 has 4 divisors (see below), whose sum is σ = 18800160. Its totient is φ = 18681288.

The previous prime is 18740719. The next prime is 18740737. The reversal of 18740723 is 32704781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18740723 - 2² = 18740719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18740723.

It is not an unprimeable number, because it can be changed into a prime (18740713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29243 + ... + 29876.

It is an arithmetic number, because the mean of its divisors is an integer number (4700040).

Almost surely, 2^18740723 is an apocalyptic number.

18740723 is a deficient number, since it is larger than the sum of its proper divisors (59437).

18740723 is an equidigital number, since it uses as much as digits as its factorization.

18740723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59436.

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

The square root of 18740723 is about 4329.0556706977. The cubic root of 18740723 is about 265.6208204740.

The spelling of 18740723 in words is "eighteen million, seven hundred forty thousand, seven hundred twenty-three".