18216871 has 8 divisors (see below), whose sum is σ = 19206144. Its totient is φ = 17252760.

The previous prime is 18216859. The next prime is 18216881. The reversal of 18216871 is 17861281.

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

It is not a de Polignac number, because 18216871 - 2¹⁷ = 18085799 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 (18216811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4795 + ... + 7708.

It is an arithmetic number, because the mean of its divisors is an integer number (2400768).

Almost surely, 2^18216871 is an apocalyptic number.

18216871 is a deficient number, since it is larger than the sum of its proper divisors (989273).

18216871 is a wasteful number, since it uses less digits than its factorization.

18216871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12581.

The product of its digits is 5376, while the sum is 34.

The square root of 18216871 is about 4268.1226552197. The cubic root of 18216871 is about 263.1224641345.

The spelling of 18216871 in words is "eighteen million, two hundred sixteen thousand, eight hundred seventy-one".