12640312 has 16 divisors (see below), whose sum is σ = 24465600. Its totient is φ = 6116160.

The previous prime is 12640307. The next prime is 12640351. The reversal of 12640312 is 21304621.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 12640312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25237 + ... + 25732.

It is an arithmetic number, because the mean of its divisors is an integer number (1529100).

Almost surely, 2^12640312 is an apocalyptic number.

It is an amenable number.

12640312 is a deficient number, since it is larger than the sum of its proper divisors (11825288).

12640312 is a wasteful number, since it uses less digits than its factorization.

12640312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51006 (or 51002 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 12640312 is about 3555.3216450836. The cubic root of 12640312 is about 232.9445735034.

Adding to 12640312 its reverse (21304621), we get a palindrome (33944933).

The spelling of 12640312 in words is "twelve million, six hundred forty thousand, three hundred twelve".