18008389 has 16 divisors (see below), whose sum is σ = 22329216. Its totient is φ = 14169600.

The previous prime is 18008387. The next prime is 18008413. The reversal of 18008389 is 98380081.

It is not a de Polignac number, because 18008389 - 2¹ = 18008387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3034 + ... + 6724.

It is an arithmetic number, because the mean of its divisors is an integer number (1395576).

Almost surely, 2^18008389 is an apocalyptic number.

It is an amenable number.

18008389 is a deficient number, since it is larger than the sum of its proper divisors (4320827).

18008389 is a wasteful number, since it uses less digits than its factorization.

18008389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3756.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18008389 is about 4243.6292250855. The cubic root of 18008389 is about 262.1148468005.

The spelling of 18008389 in words is "eighteen million, eight thousand, three hundred eighty-nine".