16640012 has 6 divisors (see below), whose sum is σ = 29120028. Its totient is φ = 8320004.

The previous prime is 16640003. The next prime is 16640023. The reversal of 16640012 is 21004661.

It is a happy number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2079998 + ... + 2080005.

It is an arithmetic number, because the mean of its divisors is an integer number (4853338).

Almost surely, 2^16640012 is an apocalyptic number.

It is an amenable number.

16640012 is a deficient number, since it is larger than the sum of its proper divisors (12480016).

16640012 is a wasteful number, since it uses less digits than its factorization.

16640012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160007 (or 4160005 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 16640012 is about 4079.2170817450. The cubic root of 16640012 is about 255.3002333246.

Adding to 16640012 its reverse (21004661), we get a palindrome (37644673).

The spelling of 16640012 in words is "sixteen million, six hundred forty thousand, twelve".