18055143 has 14 divisors (see below), whose sum is σ = 27071424. Its totient is φ = 12036276.

The previous prime is 18055099. The next prime is 18055151. The reversal of 18055143 is 34155081.

It is not a de Polignac number, because 18055143 - 2⁸ = 18054887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 11655 + ... + 13112.

Almost surely, 2^18055143 is an apocalyptic number.

18055143 is a deficient number, since it is larger than the sum of its proper divisors (9016281).

18055143 is an frugal number, since it uses more digits than its factorization.

18055143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24785 (or 24770 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 18055143 is about 4249.1343824360. The cubic root of 18055143 is about 262.3414879744.

It can be divided in two parts, 180 and 55143, that multiplied together give a triangular number (9925740 = T₄₄₅₅).

The spelling of 18055143 in words is "eighteen million, fifty-five thousand, one hundred forty-three".