16690 has 8 divisors (see below), whose sum is σ = 30060. Its totient is φ = 6672.

The previous prime is 16673. The next prime is 16691. The reversal of 16690 is 9661.

16690 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16641 + 49 = 129^2 + 7^2 .

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

It is a super-2 number, since 2×16690² = 557112200, which contains 22 as substring.

16690 is strictly pandigital in base 6.

It is a plaindrome in base 13.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (16691) by changing a digit.

16690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825 + ... + 844.

2¹⁶⁶⁹⁰ is an apocalyptic number.

16690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16690 is a deficient number, since it is larger than the sum of its proper divisors (13370).

16690 is a wasteful number, since it uses less digits than its factorization.

16690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 16690 is about 129.1897828777. The cubic root of 16690 is about 25.5555625569. Note that the first 4 decimals are identical.

It can be divided in two parts, 166 and 90, that added together give a 8-th power (256 = 2⁸).

The spelling of 16690 in words is "sixteen thousand, six hundred ninety".