18009475 has 24 divisors (see below), whose sum is σ = 24944832. Its totient is φ = 12784800.

The previous prime is 18009469. The next prime is 18009479. The reversal of 18009475 is 57490081.

It is a happy number.

It is not a de Polignac number, because 18009475 - 2¹⁷ = 17878403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18009475.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18009479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11064 + ... + 12586.

It is an arithmetic number, because the mean of its divisors is an integer number (1039368).

Almost surely, 2^18009475 is an apocalyptic number.

18009475 is a deficient number, since it is larger than the sum of its proper divisors (6935357).

18009475 is a wasteful number, since it uses less digits than its factorization.

18009475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 18009475 is about 4243.7571796699. The cubic root of 18009475 is about 262.1201156597.

The spelling of 18009475 in words is "eighteen million, nine thousand, four hundred seventy-five".