18549145 has 4 divisors (see below), whose sum is σ = 22258980. Its totient is φ = 14839312.

The previous prime is 18549143. The next prime is 18549197. The reversal of 18549145 is 54194581.

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 3268864 + 15280281 = 1808^2 + 3909^2 .

It is a cyclic number.

It is not a de Polignac number, because 18549145 - 2¹ = 18549143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18549143) 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, 1854910 + ... + 1854919.

It is an arithmetic number, because the mean of its divisors is an integer number (5564745).

Almost surely, 2^18549145 is an apocalyptic number.

It is an amenable number.

18549145 is a deficient number, since it is larger than the sum of its proper divisors (3709835).

18549145 is an equidigital number, since it uses as much as digits as its factorization.

18549145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3709834.

The product of its digits is 28800, while the sum is 37.

The square root of 18549145 is about 4306.8718346382. The cubic root of 18549145 is about 264.7126111918.

The spelling of 18549145 in words is "eighteen million, five hundred forty-nine thousand, one hundred forty-five".