18442271 has 4 divisors (see below), whose sum is σ = 18544344. Its totient is φ = 18340200.

The previous prime is 18442247. The next prime is 18442337. The reversal of 18442271 is 17224481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18442271 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 (18442201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50765 + ... + 51126.

It is an arithmetic number, because the mean of its divisors is an integer number (4636086).

Almost surely, 2^18442271 is an apocalyptic number.

18442271 is a deficient number, since it is larger than the sum of its proper divisors (102073).

18442271 is a wasteful number, since it uses less digits than its factorization.

18442271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102072.

The product of its digits is 3584, while the sum is 29.

The square root of 18442271 is about 4294.4465301130. The cubic root of 18442271 is about 264.2032363313.

The spelling of 18442271 in words is "eighteen million, four hundred forty-two thousand, two hundred seventy-one".