16603985 has 8 divisors (see below), whose sum is σ = 21096936. Its totient is φ = 12501760.

The previous prime is 16603981. The next prime is 16603987. The reversal of 16603985 is 58930661.

It can be written as a sum of positive squares in 4 ways, for example, as 595984 + 16008001 = 772^2 + 4001^2 .

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

It is not a de Polignac number, because 16603985 - 2² = 16603981 is a prime.

It is a super-3 number, since 3×16603985³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16603981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97586 + ... + 97755.

It is an arithmetic number, because the mean of its divisors is an integer number (2637117).

Almost surely, 2^16603985 is an apocalyptic number.

It is an amenable number.

16603985 is a deficient number, since it is larger than the sum of its proper divisors (4492951).

16603985 is a wasteful number, since it uses less digits than its factorization.

16603985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195363.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 16603985 is about 4074.7987680375. The cubic root of 16603985 is about 255.1158514979.

The spelling of 16603985 in words is "sixteen million, six hundred three thousand, nine hundred eighty-five".