16649943 has 8 divisors (see below), whose sum is σ = 22249728. Its totient is φ = 11075064.

The previous prime is 16649933. The next prime is 16649957. The reversal of 16649943 is 34994661.

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

It is not a de Polignac number, because 16649943 - 2⁵ = 16649911 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 junction number, because it is equal to n+sod(n) for n = 16649895 and 16649904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16649923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4605 + ... + 7382.

It is an arithmetic number, because the mean of its divisors is an integer number (2781216).

Almost surely, 2^16649943 is an apocalyptic number.

16649943 is a deficient number, since it is larger than the sum of its proper divisors (5599785).

16649943 is a wasteful number, since it uses less digits than its factorization.

16649943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12453.

The product of its digits is 139968, while the sum is 42.

The square root of 16649943 is about 4080.4341680757. The cubic root of 16649943 is about 255.3510121822.

The spelling of 16649943 in words is "sixteen million, six hundred forty-nine thousand, nine hundred forty-three".