16491793 has 4 divisors (see below), whose sum is σ = 16519140. Its totient is φ = 16464448.

The previous prime is 16491779. The next prime is 16491821. The reversal of 16491793 is 39719461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4464769 + 12027024 = 2113^2 + 3468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16491793 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16491743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12748 + ... + 13981.

It is an arithmetic number, because the mean of its divisors is an integer number (4129785).

Almost surely, 2^16491793 is an apocalyptic number.

It is an amenable number.

16491793 is a deficient number, since it is larger than the sum of its proper divisors (27347).

16491793 is an equidigital number, since it uses as much as digits as its factorization.

16491793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27346.

The product of its digits is 40824, while the sum is 40.

The square root of 16491793 is about 4061.0088648019. The cubic root of 16491793 is about 254.5399522736.

The spelling of 16491793 in words is "sixteen million, four hundred ninety-one thousand, seven hundred ninety-three".