186640012 has 24 divisors (see below), whose sum is σ = 353794896. Its totient is φ = 85639488.

The previous prime is 186640007. The next prime is 186640019. The reversal of 186640012 is 210046681.

It is not an unprimeable number, because it can be changed into a prime (186640019) 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, 1378 + ... + 19369.

It is an arithmetic number, because the mean of its divisors is an integer number (14741454).

Almost surely, 2^186640012 is an apocalyptic number.

It is an amenable number.

186640012 is a deficient number, since it is larger than the sum of its proper divisors (167154884).

186640012 is a wasteful number, since it uses less digits than its factorization.

186640012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20937 (or 20935 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 186640012 is about 13661.6255255368. The cubic root of 186640012 is about 571.4807217762.

Adding to 186640012 its reverse (210046681), we get a palindrome (396686693).

The spelling of 186640012 in words is "one hundred eighty-six million, six hundred forty thousand, twelve".