18140871 has 8 divisors (see below), whose sum is σ = 27643264. Its totient is φ = 10366200.

The previous prime is 18140869. The next prime is 18140891. The reversal of 18140871 is 17804181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18140871 - 2¹ = 18140869 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 (18140821) 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 7 ways as a sum of consecutive naturals, for example, 431905 + ... + 431946.

It is an arithmetic number, because the mean of its divisors is an integer number (3455408).

Almost surely, 2^18140871 is an apocalyptic number.

18140871 is a deficient number, since it is larger than the sum of its proper divisors (9502393).

18140871 is an equidigital number, since it uses as much as digits as its factorization.

18140871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863861.

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 18140871 is about 4259.2101380420. The cubic root of 18140871 is about 262.7560422389.

The spelling of 18140871 in words is "eighteen million, one hundred forty thousand, eight hundred seventy-one".