18743845 has 16 divisors (see below), whose sum is σ = 23096880. Its totient is φ = 14598144.

The previous prime is 18743839. The next prime is 18743849. The reversal of 18743845 is 54834781.

It can be written as a sum of positive squares in 8 ways, for example, as 408321 + 18335524 = 639^2 + 4282^2 .

It is a cyclic number.

It is not a de Polignac number, because 18743845 - 2⁷ = 18743717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18743798 and 18743807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18743849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32197 + ... + 32773.

It is an arithmetic number, because the mean of its divisors is an integer number (1443555).

Almost surely, 2^18743845 is an apocalyptic number.

It is an amenable number.

18743845 is a deficient number, since it is larger than the sum of its proper divisors (4353035).

18743845 is an equidigital number, since it uses as much as digits as its factorization.

18743845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744.

The product of its digits is 107520, while the sum is 40.

The square root of 18743845 is about 4329.4162424050. The cubic root of 18743845 is about 265.6355694987.

The spelling of 18743845 in words is "eighteen million, seven hundred forty-three thousand, eight hundred forty-five".