18942789 has 4 divisors (see below), whose sum is σ = 25257056. Its totient is φ = 12628524.

The previous prime is 18942769. The next prime is 18942809. The reversal of 18942789 is 98724981.

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 an interprime number because it is at equal distance from previous prime (18942769) and next prime (18942809).

It is not a de Polignac number, because 18942789 - 2²⁰ = 17894213 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 (18942769) 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, 3157129 + ... + 3157134.

It is an arithmetic number, because the mean of its divisors is an integer number (6314264).

Almost surely, 2^18942789 is an apocalyptic number.

It is an amenable number.

18942789 is a deficient number, since it is larger than the sum of its proper divisors (6314267).

18942789 is an equidigital number, since it uses as much as digits as its factorization.

18942789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6314266.

The product of its digits is 290304, while the sum is 48.

The square root of 18942789 is about 4352.3314441802. The cubic root of 18942789 is about 266.5720676606.

The spelling of 18942789 in words is "eighteen million, nine hundred forty-two thousand, seven hundred eighty-nine".