18280143 has 12 divisors (see below), whose sum is σ = 30176848. Its totient is φ = 10445760.

The previous prime is 18280099. The next prime is 18280159. The reversal of 18280143 is 34108281.

It is not a de Polignac number, because 18280143 - 2¹⁶ = 18214607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18280343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145018 + ... + 145143.

Almost surely, 2^18280143 is an apocalyptic number.

18280143 is a deficient number, since it is larger than the sum of its proper divisors (11896705).

18280143 is a wasteful number, since it uses less digits than its factorization.

18280143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290174 (or 290171 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18280143 is about 4275.5283883983. The cubic root of 18280143 is about 263.4267433753.

The spelling of 18280143 in words is "eighteen million, two hundred eighty thousand, one hundred forty-three".