16705385 has 4 divisors (see below), whose sum is σ = 20046468. Its totient is φ = 13364304.

The previous prime is 16705361. The next prime is 16705387. The reversal of 16705385 is 58350761.

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 2650384 + 14055001 = 1628^2 + 3749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16705385 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16705387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1670534 + ... + 1670543.

It is an arithmetic number, because the mean of its divisors is an integer number (5011617).

Almost surely, 2^16705385 is an apocalyptic number.

It is an amenable number.

16705385 is a deficient number, since it is larger than the sum of its proper divisors (3341083).

16705385 is an equidigital number, since it uses as much as digits as its factorization.

16705385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341082.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 16705385 is about 4087.2221618111. Note that the first 3 decimals coincide. The cubic root of 16705385 is about 255.6341259846.

The spelling of 16705385 in words is "sixteen million, seven hundred five thousand, three hundred eighty-five".