16997885 has 4 divisors (see below), whose sum is σ = 20397468. Its totient is φ = 13598304.

The previous prime is 16997867. The next prime is 16997887. The reversal of 16997885 is 58879961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10413529 + 6584356 = 3227^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 16997885 - 2¹² = 16993789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16997887) 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, 1699784 + ... + 1699793.

It is an arithmetic number, because the mean of its divisors is an integer number (5099367).

Almost surely, 2^16997885 is an apocalyptic number.

It is an amenable number.

16997885 is a deficient number, since it is larger than the sum of its proper divisors (3399583).

16997885 is an equidigital number, since it uses as much as digits as its factorization.

16997885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399582.

The product of its digits is 1088640, while the sum is 53.

The square root of 16997885 is about 4122.8491362164. The cubic root of 16997885 is about 257.1174953676.

The spelling of 16997885 in words is "sixteen million, nine hundred ninety-seven thousand, eight hundred eighty-five".