18142889 has 4 divisors (see below), whose sum is σ = 18154500. Its totient is φ = 18131280.

The previous prime is 18142879. The next prime is 18142919. The reversal of 18142889 is 98824181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98824181 = 79 ⋅1250939.

It can be written as a sum of positive squares in 2 ways, for example, as 795664 + 17347225 = 892^2 + 4165^2 .

It is a cyclic number.

It is not a de Polignac number, because 18142889 - 2⁸ = 18142633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18142819) 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, 3014 + ... + 6735.

It is an arithmetic number, because the mean of its divisors is an integer number (4538625).

Almost surely, 2^18142889 is an apocalyptic number.

It is an amenable number.

18142889 is a deficient number, since it is larger than the sum of its proper divisors (11611).

18142889 is an equidigital number, since it uses as much as digits as its factorization.

18142889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11610.

The product of its digits is 36864, while the sum is 41.

The square root of 18142889 is about 4259.4470298385. The cubic root of 18142889 is about 262.7657849177.

The spelling of 18142889 in words is "eighteen million, one hundred forty-two thousand, eight hundred eighty-nine".