16108985 has 8 divisors (see below), whose sum is σ = 19454856. Its totient is φ = 12804480.

The previous prime is 16108973. The next prime is 16108991. The reversal of 16108985 is 58980161.

It can be written as a sum of positive squares in 4 ways, for example, as 1301881 + 14807104 = 1141^2 + 3848^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-16108985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9476 + ... + 11045.

It is an arithmetic number, because the mean of its divisors is an integer number (2431857).

Almost surely, 2^16108985 is an apocalyptic number.

It is an amenable number.

16108985 is a deficient number, since it is larger than the sum of its proper divisors (3345871).

16108985 is a wasteful number, since it uses less digits than its factorization.

16108985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20683.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 16108985 is about 4013.6000049831. The cubic root of 16108985 is about 252.5550512257. Note that the first 3 decimals are identical.

The spelling of 16108985 in words is "sixteen million, one hundred eight thousand, nine hundred eighty-five".