18988789 has 4 divisors (see below), whose sum is σ = 19068480. Its totient is φ = 18909100.

The previous prime is 18988769. The next prime is 18988793. The reversal of 18988789 is 98788981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98788981 = 1231 ⋅80251.

It is a cyclic number.

It is not a de Polignac number, because 18988789 - 2¹³ = 18980597 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 (18988729) 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, 39487 + ... + 39964.

It is an arithmetic number, because the mean of its divisors is an integer number (4767120).

Almost surely, 2^18988789 is an apocalyptic number.

It is an amenable number.

18988789 is a deficient number, since it is larger than the sum of its proper divisors (79691).

18988789 is an equidigital number, since it uses as much as digits as its factorization.

18988789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79690.

The product of its digits is 2322432, while the sum is 58.

The square root of 18988789 is about 4357.6127638880. The cubic root of 18988789 is about 266.7876712990.

The spelling of 18988789 in words is "eighteen million, nine hundred eighty-eight thousand, seven hundred eighty-nine".