18857089 has 4 divisors (see below), whose sum is σ = 19317060. Its totient is φ = 18397120.

The previous prime is 18857081. The next prime is 18857099. The reversal of 18857089 is 98075881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98075881 = 2543 ⋅38567.

It can be written as a sum of positive squares in 2 ways, for example, as 10400625 + 8456464 = 3225^2 + 2908^2 .

It is a cyclic number.

It is not a de Polignac number, because 18857089 - 2³ = 18857081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18857081) 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, 229924 + ... + 230005.

It is an arithmetic number, because the mean of its divisors is an integer number (4829265).

Almost surely, 2^18857089 is an apocalyptic number.

It is an amenable number.

18857089 is a deficient number, since it is larger than the sum of its proper divisors (459971).

18857089 is an equidigital number, since it uses as much as digits as its factorization.

18857089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459970.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 18857089 is about 4342.4749855353. The cubic root of 18857089 is about 266.1694559722.

The spelling of 18857089 in words is "eighteen million, eight hundred fifty-seven thousand, eighty-nine".