18741871 has 4 divisors (see below), whose sum is σ = 19844352. Its totient is φ = 17639392.

The previous prime is 18741839. The next prime is 18741883. The reversal of 18741871 is 17814781.

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 18741871 - 2⁵ = 18741839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18741871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18744871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551215 + ... + 551248.

It is an arithmetic number, because the mean of its divisors is an integer number (4961088).

Almost surely, 2^18741871 is an apocalyptic number.

18741871 is a deficient number, since it is larger than the sum of its proper divisors (1102481).

18741871 is a wasteful number, since it uses less digits than its factorization.

18741871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102480.

The product of its digits is 12544, while the sum is 37.

The square root of 18741871 is about 4329.1882610947. The cubic root of 18741871 is about 265.6262440726.

It can be divided in two parts, 187418 and 71, that added together give a square (187489 = 433²).

The spelling of 18741871 in words is "eighteen million, seven hundred forty-one thousand, eight hundred seventy-one".