12640366 has 16 divisors (see below), whose sum is σ = 19603584. Its totient is φ = 6108984.

The previous prime is 12640351. The next prime is 12640373. The reversal of 12640366 is 66304621.

It is a super-2 number, since 2×12640366² = 319557705227912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8145 + ... + 9571.

It is an arithmetic number, because the mean of its divisors is an integer number (1225224).

Almost surely, 2^12640366 is an apocalyptic number.

12640366 is a deficient number, since it is larger than the sum of its proper divisors (6963218).

12640366 is a wasteful number, since it uses less digits than its factorization.

12640366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 12640366 is about 3555.3292393251. The cubic root of 12640366 is about 232.9449052196.

Adding to 12640366 its reverse (66304621), we get a palindrome (78944987).

The spelling of 12640366 in words is "twelve million, six hundred forty thousand, three hundred sixty-six".