18142871 has 4 divisors (see below), whose sum is σ = 18155592. Its totient is φ = 18130152.

The previous prime is 18142867. The next prime is 18142877. The reversal of 18142871 is 17824181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17824181 = 3331 ⋅5351.

It is a cyclic number.

It is not a de Polignac number, because 18142871 - 2² = 18142867 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 (18142877) 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 3 ways as a sum of consecutive naturals, for example, 3905 + ... + 7178.

It is an arithmetic number, because the mean of its divisors is an integer number (4538898).

Almost surely, 2^18142871 is an apocalyptic number.

18142871 is a deficient number, since it is larger than the sum of its proper divisors (12721).

18142871 is a wasteful number, since it uses less digits than its factorization.

18142871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12720.

The product of its digits is 3584, while the sum is 32.

The square root of 18142871 is about 4259.4449168876. Note that the first 3 decimals coincide. The cubic root of 18142871 is about 262.7656980189.

The spelling of 18142871 in words is "eighteen million, one hundred forty-two thousand, eight hundred seventy-one".