18986071 has 4 divisors (see below), whose sum is σ = 20446552. Its totient is φ = 17525592.

The previous prime is 18986057. The next prime is 18986083. The reversal of 18986071 is 17068981.

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 18986071 - 2⁷ = 18985943 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 (18986171) 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, 730221 + ... + 730246.

It is an arithmetic number, because the mean of its divisors is an integer number (5111638).

Almost surely, 2^18986071 is an apocalyptic number.

18986071 is a deficient number, since it is larger than the sum of its proper divisors (1460481).

18986071 is a wasteful number, since it uses less digits than its factorization.

18986071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460480.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18986071 is about 4357.3008847221. The cubic root of 18986071 is about 266.7749416213.

The spelling of 18986071 in words is "eighteen million, nine hundred eighty-six thousand, seventy-one".