18089985 has 8 divisors (see below), whose sum is σ = 28944000. Its totient is φ = 9647984.

The previous prime is 18089969. The next prime is 18090001. The reversal of 18089985 is 58998081.

It is an interprime number because it is at equal distance from previous prime (18089969) and next prime (18090001).

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

It is a cyclic number.

It is not a de Polignac number, because 18089985 - 2⁴ = 18089969 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602985 + ... + 603014.

It is an arithmetic number, because the mean of its divisors is an integer number (3618000).

Almost surely, 2^18089985 is an apocalyptic number.

18089985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18089985 is a deficient number, since it is larger than the sum of its proper divisors (10854015).

18089985 is a wasteful number, since it uses less digits than its factorization.

18089985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206007.

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 18089985 is about 4253.2323002629. The cubic root of 18089985 is about 262.5101311283.

The spelling of 18089985 in words is "eighteen million, eighty-nine thousand, nine hundred eighty-five".