18009485 has 12 divisors (see below), whose sum is σ = 23402772. Its totient is φ = 13298688.

The previous prime is 18009479. The next prime is 18009503. The reversal of 18009485 is 58490081.

It can be written as a sum of positive squares in 6 ways, for example, as 5484964 + 12524521 = 2342^2 + 3539^2 .

It is not a de Polignac number, because 18009485 - 2⁴ = 18009469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9812 + ... + 11501.

It is an arithmetic number, because the mean of its divisors is an integer number (1950231).

Almost surely, 2^18009485 is an apocalyptic number.

It is an amenable number.

18009485 is a deficient number, since it is larger than the sum of its proper divisors (5393287).

18009485 is a wasteful number, since it uses less digits than its factorization.

18009485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21344 (or 21331 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18009485 is about 4243.7583578710. The cubic root of 18009485 is about 262.1201641749.

The spelling of 18009485 in words is "eighteen million, nine thousand, four hundred eighty-five".