18747143 has 4 divisors (see below), whose sum is σ = 18783648. Its totient is φ = 18710640.

The previous prime is 18747121. The next prime is 18747161. The reversal of 18747143 is 34174781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34174781 = 47 ⋅727123.

It is a cyclic number.

It is not a de Polignac number, because 18747143 - 2⁸ = 18746887 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 (18747163) 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, 17471 + ... + 18512.

It is an arithmetic number, because the mean of its divisors is an integer number (4695912).

Almost surely, 2^18747143 is an apocalyptic number.

18747143 is a deficient number, since it is larger than the sum of its proper divisors (36505).

18747143 is an equidigital number, since it uses as much as digits as its factorization.

18747143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36504.

The product of its digits is 18816, while the sum is 35.

The square root of 18747143 is about 4329.7971084105. The cubic root of 18747143 is about 265.6511482079.

The spelling of 18747143 in words is "eighteen million, seven hundred forty-seven thousand, one hundred forty-three".