18745873 has 4 divisors (see below), whose sum is σ = 18834928. Its totient is φ = 18656820.

The previous prime is 18745871. The next prime is 18745877. The reversal of 18745873 is 37854781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37854781 = 107 ⋅353783.

It is a cyclic number.

It is not a de Polignac number, because 18745873 - 2¹ = 18745871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18745871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44211 + ... + 44632.

It is an arithmetic number, because the mean of its divisors is an integer number (4708732).

Almost surely, 2^18745873 is an apocalyptic number.

It is an amenable number.

18745873 is a deficient number, since it is larger than the sum of its proper divisors (89055).

18745873 is an equidigital number, since it uses as much as digits as its factorization.

18745873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89054.

The product of its digits is 188160, while the sum is 43.

The square root of 18745873 is about 4329.6504477844. The cubic root of 18745873 is about 265.6451493458.

The spelling of 18745873 in words is "eighteen million, seven hundred forty-five thousand, eight hundred seventy-three".