18930271 has 4 divisors (see below), whose sum is σ = 19066600. Its totient is φ = 18793944.

The previous prime is 18930269. The next prime is 18930281. The reversal of 18930271 is 17203981.

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 18930271 - 2¹ = 18930269 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 (18930281) 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, 67956 + ... + 68233.

It is an arithmetic number, because the mean of its divisors is an integer number (4766650).

Almost surely, 2^18930271 is an apocalyptic number.

18930271 is a deficient number, since it is larger than the sum of its proper divisors (136329).

18930271 is a wasteful number, since it uses less digits than its factorization.

18930271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136328.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 18930271 is about 4350.8931267040. The cubic root of 18930271 is about 266.5133349424.

The spelling of 18930271 in words is "eighteen million, nine hundred thirty thousand, two hundred seventy-one".