18003745 has 4 divisors (see below), whose sum is σ = 21604500. Its totient is φ = 14402992.

The previous prime is 18003743. The next prime is 18003749. The reversal of 18003745 is 54730081.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12616704 + 5387041 = 3552^2 + 2321^2 .

It is a cyclic number.

It is not a de Polignac number, because 18003745 - 2¹ = 18003743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18003743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800370 + ... + 1800379.

It is an arithmetic number, because the mean of its divisors is an integer number (5401125).

Almost surely, 2^18003745 is an apocalyptic number.

It is an amenable number.

18003745 is a deficient number, since it is larger than the sum of its proper divisors (3600755).

18003745 is an equidigital number, since it uses as much as digits as its factorization.

18003745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600754.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 18003745 is about 4243.0820166478. The cubic root of 18003745 is about 262.0923134874.

The spelling of 18003745 in words is "eighteen million, three thousand, seven hundred forty-five".