16978 has 8 divisors (see below), whose sum is σ = 27468. Its totient is φ = 7824.

The previous prime is 16963. The next prime is 16979. The reversal of 16978 is 87961.

It can be written as a sum of positive squares in 2 ways, for example, as 15129 + 1849 = 123^2 + 43^2 .

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

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (16979) by changing a digit.

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, 301 + ... + 352.

2¹⁶⁹⁷⁸ is an apocalyptic number.

16978 is a deficient number, since it is larger than the sum of its proper divisors (10490).

16978 is a wasteful number, since it uses less digits than its factorization.

16978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668.

The product of its digits is 3024, while the sum is 31.

The square root of 16978 is about 130.2996546427. The cubic root of 16978 is about 25.7017193155.

Adding to 16978 its product of digits (3024), we get a palindrome (20002).

The spelling of 16978 in words is "sixteen thousand, nine hundred seventy-eight".