16943909 has 8 divisors (see below), whose sum is σ = 17420760. Its totient is φ = 16473600.

The previous prime is 16943881. The next prime is 16943921. The reversal of 16943909 is 90934961.

It can be written as a sum of positive squares in 4 ways, for example, as 3276100 + 13667809 = 1810^2 + 3697^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16943909 - 2¹⁶ = 16878373 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 (16943929) 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, 3869 + ... + 6989.

It is an arithmetic number, because the mean of its divisors is an integer number (2177595).

Almost surely, 2^16943909 is an apocalyptic number.

It is an amenable number.

16943909 is a deficient number, since it is larger than the sum of its proper divisors (476851).

16943909 is an equidigital number, since it uses as much as digits as its factorization.

16943909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 16943909 is about 4116.2979726934. The cubic root of 16943909 is about 256.8450518698.

The spelling of 16943909 in words is "sixteen million, nine hundred forty-three thousand, nine hundred nine".