16678979 has 8 divisors (see below), whose sum is σ = 18320640. Its totient is φ = 15113736.

The previous prime is 16678957. The next prime is 16678997. The reversal of 16678979 is 97987661.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16678979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16678979.

It is not an unprimeable number, because it can be changed into a prime (16678919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18647 + ... + 19520.

It is an arithmetic number, because the mean of its divisors is an integer number (2290080).

Almost surely, 2^16678979 is an apocalyptic number.

16678979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16678979 is a deficient number, since it is larger than the sum of its proper divisors (1641661).

16678979 is a wasteful number, since it uses less digits than its factorization.

16678979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38209.

The product of its digits is 1143072, while the sum is 53.

The square root of 16678979 is about 4083.9905729568. The cubic root of 16678979 is about 255.4993623630.

The spelling of 16678979 in words is "sixteen million, six hundred seventy-eight thousand, nine hundred seventy-nine".