18008845 has 8 divisors (see below), whose sum is σ = 21635064. Its totient is φ = 14390784.

The previous prime is 18008843. The next prime is 18008857. The reversal of 18008845 is 54880081.

It can be written as a sum of positive squares in 4 ways, for example, as 4088484 + 13920361 = 2022^2 + 3731^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18008845 - 2¹ = 18008843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18008845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008843) 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 7 ways as a sum of consecutive naturals, for example, 5097 + ... + 7873.

It is an arithmetic number, because the mean of its divisors is an integer number (2704383).

Almost surely, 2^18008845 is an apocalyptic number.

It is an amenable number.

18008845 is a deficient number, since it is larger than the sum of its proper divisors (3626219).

18008845 is a wasteful number, since it uses less digits than its factorization.

18008845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 18008845 is about 4243.6829523422. The cubic root of 18008845 is about 262.1170591650.

The spelling of 18008845 in words is "eighteen million, eight thousand, eight hundred forty-five".