16873909 has 4 divisors (see below), whose sum is σ = 18171916. Its totient is φ = 15575904.

The previous prime is 16873907. The next prime is 16873921. The reversal of 16873909 is 90937861.

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 8910225 + 7963684 = 2985^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 16873909 - 2¹ = 16873907 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 (16873903) 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, 648984 + ... + 649009.

It is an arithmetic number, because the mean of its divisors is an integer number (4542979).

Almost surely, 2^16873909 is an apocalyptic number.

It is an amenable number.

16873909 is a deficient number, since it is larger than the sum of its proper divisors (1298007).

16873909 is a wasteful number, since it uses less digits than its factorization.

16873909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298006.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 16873909 is about 4107.7863868512. The cubic root of 16873909 is about 256.4908642268.

The spelling of 16873909 in words is "sixteen million, eight hundred seventy-three thousand, nine hundred nine".