12640322 has 8 divisors (see below), whose sum is σ = 19008972. Its totient is φ = 6304000.

The previous prime is 12640307. The next prime is 12640351. The reversal of 12640322 is 22304621.

It can be written as a sum of positive squares in 2 ways, for example, as 10621081 + 2019241 = 3259^2 + 1421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 12640294 and 12640303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7079 + ... + 8682.

Almost surely, 2^12640322 is an apocalyptic number.

12640322 is a deficient number, since it is larger than the sum of its proper divisors (6368650).

12640322 is a wasteful number, since it uses less digits than its factorization.

12640322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16164.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 12640322 is about 3555.3230514258. The cubic root of 12640322 is about 232.9446349324.

Adding to 12640322 its reverse (22304621), we get a palindrome (34944943).

The spelling of 12640322 in words is "twelve million, six hundred forty thousand, three hundred twenty-two".