16681746 has 32 divisors (see below), whose sum is σ = 34550208. Its totient is φ = 5365440.

The previous prime is 16681733. The next prime is 16681781. The reversal of 16681746 is 64718661.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35956 + ... + 36416.

It is an arithmetic number, because the mean of its divisors is an integer number (1079694).

Almost surely, 2^16681746 is an apocalyptic number.

16681746 is an abundant number, since it is smaller than the sum of its proper divisors (17868462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16681746 is a wasteful number, since it uses less digits than its factorization.

16681746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666.

The product of its digits is 48384, while the sum is 39.

The square root of 16681746 is about 4084.3293207086. The cubic root of 16681746 is about 255.5134904789.

The spelling of 16681746 in words is "sixteen million, six hundred eighty-one thousand, seven hundred forty-six".