18530945 has 4 divisors (see below), whose sum is σ = 22237140. Its totient is φ = 14824752.

The previous prime is 18530933. The next prime is 18530959. The reversal of 18530945 is 54903581.

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 5193841 + 13337104 = 2279^2 + 3652^2 .

It is a cyclic number.

It is not a de Polignac number, because 18530945 - 2⁶ = 18530881 is a prime.

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, 1853090 + ... + 1853099.

It is an arithmetic number, because the mean of its divisors is an integer number (5559285).

Almost surely, 2^18530945 is an apocalyptic number.

It is an amenable number.

18530945 is a deficient number, since it is larger than the sum of its proper divisors (3706195).

18530945 is an equidigital number, since it uses as much as digits as its factorization.

18530945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706194.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 18530945 is about 4304.7584136627. The cubic root of 18530945 is about 264.6260061924.

The spelling of 18530945 in words is "eighteen million, five hundred thirty thousand, nine hundred forty-five".