17985138 has 8 divisors (see below), whose sum is σ = 35970288. Its totient is φ = 5995044.

The previous prime is 17985131. The next prime is 17985197. The reversal of 17985138 is 83158971.

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

17985138 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 17985138.

It is not an unprimeable number, because it can be changed into a prime (17985131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1498756 + ... + 1498767.

It is an arithmetic number, because the mean of its divisors is an integer number (4496286).

Almost surely, 2^17985138 is an apocalyptic number.

17985138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17985138 is a wasteful number, since it uses less digits than its factorization.

17985138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997528.

The product of its digits is 60480, while the sum is 42.

The square root of 17985138 is about 4240.8888219334. Note that the first 4 decimals coincide. The cubic root of 17985138 is about 262.0019909333.

The spelling of 17985138 in words is "seventeen million, nine hundred eighty-five thousand, one hundred thirty-eight".