18706789 has 4 divisors (see below), whose sum is σ = 18932256. Its totient is φ = 18481324.

The previous prime is 18706777. The next prime is 18706813. The reversal of 18706789 is 98760781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18706789 - 2¹⁷ = 18575717 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 (18706729) 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, 112609 + ... + 112774.

It is an arithmetic number, because the mean of its divisors is an integer number (4733064).

Almost surely, 2^18706789 is an apocalyptic number.

It is an amenable number.

18706789 is a deficient number, since it is larger than the sum of its proper divisors (225467).

18706789 is an equidigital number, since it uses as much as digits as its factorization.

18706789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225466.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 18706789 is about 4325.1345643806. The cubic root of 18706789 is about 265.4604029220.

The spelling of 18706789 in words is "eighteen million, seven hundred six thousand, seven hundred eighty-nine".