18214971 has 4 divisors (see below), whose sum is σ = 24286632. Its totient is φ = 12143312.

The previous prime is 18214969. The next prime is 18214981. The reversal of 18214971 is 17941281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18214971 - 2¹ = 18214969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18214921) 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, 3035826 + ... + 3035831.

It is an arithmetic number, because the mean of its divisors is an integer number (6071658).

Almost surely, 2^18214971 is an apocalyptic number.

18214971 is a deficient number, since it is larger than the sum of its proper divisors (6071661).

18214971 is an equidigital number, since it uses as much as digits as its factorization.

18214971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6071660.

The product of its digits is 4032, while the sum is 33.

The square root of 18214971 is about 4267.9000691206. The cubic root of 18214971 is about 263.1133160201.

The spelling of 18214971 in words is "eighteen million, two hundred fourteen thousand, nine hundred seventy-one".