16646493 has 8 divisors (see below), whose sum is σ = 22960800. Its totient is φ = 10714928.

The previous prime is 16646491. The next prime is 16646521. The reversal of 16646493 is 39464661.

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

It is a cyclic number.

It is not a de Polignac number, because 16646493 - 2¹ = 16646491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16646491) 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 7 ways as a sum of consecutive naturals, for example, 95583 + ... + 95756.

It is an arithmetic number, because the mean of its divisors is an integer number (2870100).

Almost surely, 2^16646493 is an apocalyptic number.

It is an amenable number.

16646493 is a deficient number, since it is larger than the sum of its proper divisors (6314307).

16646493 is a wasteful number, since it uses less digits than its factorization.

16646493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191371.

The product of its digits is 93312, while the sum is 39.

The square root of 16646493 is about 4080.0113970429. The cubic root of 16646493 is about 255.3333740468. Note that the first 4 decimals are identical.

The spelling of 16646493 in words is "sixteen million, six hundred forty-six thousand, four hundred ninety-three".