18306445 has 4 divisors (see below), whose sum is σ = 21967740. Its totient is φ = 14645152.

The previous prime is 18306419. The next prime is 18306451. The reversal of 18306445 is 54460381.

It is a happy number.

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 11737476 + 6568969 = 3426^2 + 2563^2 .

It is a cyclic number.

It is not a de Polignac number, because 18306445 - 2⁷ = 18306317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1830640 + ... + 1830649.

It is an arithmetic number, because the mean of its divisors is an integer number (5491935).

Almost surely, 2^18306445 is an apocalyptic number.

It is an amenable number.

18306445 is a deficient number, since it is larger than the sum of its proper divisors (3661295).

18306445 is an equidigital number, since it uses as much as digits as its factorization.

18306445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661294.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 18306445 is about 4278.6031599110. The cubic root of 18306445 is about 263.5530248420.

The spelling of 18306445 in words is "eighteen million, three hundred six thousand, four hundred forty-five".