18012143 has 2 divisors, whose sum is σ = 18012144. Its totient is φ = 18012142.

The previous prime is 18012131. The next prime is 18012149. The reversal of 18012143 is 34121081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18012143 - 2⁸ = 18011887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18012149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9006071 + 9006072.

It is an arithmetic number, because the mean of its divisors is an integer number (9006072).

Almost surely, 2^18012143 is an apocalyptic number.

18012143 is a deficient number, since it is larger than the sum of its proper divisors (1).

18012143 is an equidigital number, since it uses as much as digits as its factorization.

18012143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18012143 is about 4244.0715121213. The cubic root of 18012143 is about 262.1330588824.

The spelling of 18012143 in words is "eighteen million, twelve thousand, one hundred forty-three".