18055871 has 12 divisors (see below), whose sum is σ = 19394280. Its totient is φ = 16761600.

The previous prime is 18055859. The next prime is 18055879. The reversal of 18055871 is 17855081.

It is a de Polignac number, because none of the positive numbers 2^k-18055871 is a prime.

It is a super-3 number, since 3×18055871³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055879) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 178721 + ... + 178821.

It is an arithmetic number, because the mean of its divisors is an integer number (1616190).

Almost surely, 2^18055871 is an apocalyptic number.

18055871 is a deficient number, since it is larger than the sum of its proper divisors (1338409).

18055871 is an equidigital number, since it uses as much as digits as its factorization.

18055871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 18055871 is about 4249.2200460790. The cubic root of 18055871 is about 262.3450138772.

The spelling of 18055871 in words is "eighteen million, fifty-five thousand, eight hundred seventy-one".