18008789 has 8 divisors (see below), whose sum is σ = 19044000. Its totient is φ = 16982352.

The previous prime is 18008777. The next prime is 18008801. The reversal of 18008789 is 98780081.

It is an interprime number because it is at equal distance from previous prime (18008777) and next prime (18008801).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18008789 - 2⁸ = 18008533 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 (18008189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2282 + ... + 6420.

It is an arithmetic number, because the mean of its divisors is an integer number (2380500).

Almost surely, 2^18008789 is an apocalyptic number.

18008789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18008789 is a deficient number, since it is larger than the sum of its proper divisors (1035211).

18008789 is a wasteful number, since it uses less digits than its factorization.

18008789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4387.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 18008789 is about 4243.6763542947. The cubic root of 18008789 is about 262.1167874731.

The spelling of 18008789 in words is "eighteen million, eight thousand, seven hundred eighty-nine".