16643812 has 24 divisors (see below), whose sum is σ = 30647232. Its totient is φ = 7893600.

The previous prime is 16643779. The next prime is 16643839. The reversal of 16643812 is 21834661.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11362 + ... + 12742.

It is an arithmetic number, because the mean of its divisors is an integer number (1276968).

Almost surely, 2^16643812 is an apocalyptic number.

It is an amenable number.

16643812 is a deficient number, since it is larger than the sum of its proper divisors (14003420).

16643812 is a wasteful number, since it uses less digits than its factorization.

16643812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539 (or 1537 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 16643812 is about 4079.6828308093. The cubic root of 16643812 is about 255.3196657434.

It can be divided in two parts, 1664 and 3812, that added together give a square (5476 = 74²).

The spelling of 16643812 in words is "sixteen million, six hundred forty-three thousand, eight hundred twelve".