18447145 has 8 divisors (see below), whose sum is σ = 22356360. Its totient is φ = 14611200.

The previous prime is 18447109. The next prime is 18447223. The reversal of 18447145 is 54174481.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8637721 + 9809424 = 2939^2 + 3132^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18447145 - 2¹⁵ = 18414377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18447145.

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 7 ways as a sum of consecutive naturals, for example, 17760 + ... + 18769.

It is an arithmetic number, because the mean of its divisors is an integer number (2794545).

Almost surely, 2^18447145 is an apocalyptic number.

It is an amenable number.

18447145 is a deficient number, since it is larger than the sum of its proper divisors (3909215).

18447145 is a wasteful number, since it uses less digits than its factorization.

18447145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36635.

The product of its digits is 17920, while the sum is 34.

The square root of 18447145 is about 4295.0139697095. The cubic root of 18447145 is about 264.2265091909.

The spelling of 18447145 in words is "eighteen million, four hundred forty-seven thousand, one hundred forty-five".