18055287 has 12 divisors (see below), whose sum is σ = 26325000. Its totient is φ = 11923728.

The previous prime is 18055283. The next prime is 18055291. The reversal of 18055287 is 78255081.

It is an interprime number because it is at equal distance from previous prime (18055283) and next prime (18055291).

It is not a de Polignac number, because 18055287 - 2² = 18055283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055283) 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 11 ways as a sum of consecutive naturals, for example, 8412 + ... + 10337.

It is an arithmetic number, because the mean of its divisors is an integer number (2193750).

Almost surely, 2^18055287 is an apocalyptic number.

18055287 is a deficient number, since it is larger than the sum of its proper divisors (8269713).

18055287 is a wasteful number, since it uses less digits than its factorization.

18055287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18862 (or 18859 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 18055287 is about 4249.1513270299. The cubic root of 18055287 is about 262.3421854132.

The spelling of 18055287 in words is "eighteen million, fifty-five thousand, two hundred eighty-seven".