16921959 has 8 divisors (see below), whose sum is σ = 22585200. Its totient is φ = 11270016.

The previous prime is 16921937. The next prime is 16921969. The reversal of 16921959 is 95912961.

It is a happy number.

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

It is not a de Polignac number, because 16921959 - 2⁹ = 16921447 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 16921959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16921969) 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, 1717 + ... + 6065.

It is an arithmetic number, because the mean of its divisors is an integer number (2823150).

Almost surely, 2^16921959 is an apocalyptic number.

16921959 is a deficient number, since it is larger than the sum of its proper divisors (5663241).

16921959 is a wasteful number, since it uses less digits than its factorization.

16921959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5649.

The product of its digits is 43740, while the sum is 42.

The square root of 16921959 is about 4113.6308779471. The cubic root of 16921959 is about 256.7340939022.

The spelling of 16921959 in words is "sixteen million, nine hundred twenty-one thousand, nine hundred fifty-nine".