18027445 has 4 divisors (see below), whose sum is σ = 21632940. Its totient is φ = 14421952.

The previous prime is 18027439. The next prime is 18027481. The reversal of 18027445 is 54472081.

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 2965284 + 15062161 = 1722^2 + 3881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18027445 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1802740 + ... + 1802749.

It is an arithmetic number, because the mean of its divisors is an integer number (5408235).

Almost surely, 2^18027445 is an apocalyptic number.

It is an amenable number.

18027445 is a deficient number, since it is larger than the sum of its proper divisors (3605495).

18027445 is an equidigital number, since it uses as much as digits as its factorization.

18027445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605494.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 18027445 is about 4245.8738794269. The cubic root of 18027445 is about 262.2072685369.

It can be divided in two parts, 18027 and 445, that multiplied together give a triangular number (8022015 = T₄₀₀₅).

The spelling of 18027445 in words is "eighteen million, twenty-seven thousand, four hundred forty-five".