16893921 has 32 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 9737280.

The previous prime is 16893917. The next prime is 16893931. The reversal of 16893921 is 12939861.

It is not a de Polignac number, because 16893921 - 2² = 16893917 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16893921.

It is not an unprimeable number, because it can be changed into a prime (16893901) 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 31 ways as a sum of consecutive naturals, for example, 121470 + ... + 121608.

It is an arithmetic number, because the mean of its divisors is an integer number (806400).

Almost surely, 2^16893921 is an apocalyptic number.

16893921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16893921 is a deficient number, since it is larger than the sum of its proper divisors (8910879).

16893921 is a wasteful number, since it uses less digits than its factorization.

16893921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309.

The product of its digits is 23328, while the sum is 39.

The square root of 16893921 is about 4110.2215268766. The cubic root of 16893921 is about 256.5922212459.

The spelling of 16893921 in words is "sixteen million, eight hundred ninety-three thousand, nine hundred twenty-one".