12640122 has 24 divisors (see below), whose sum is σ = 29877120. Its totient is φ = 3830280.

The previous prime is 12640099. The next prime is 12640123. The reversal of 12640122 is 22104621.

12640122 is a `hidden beast` number, since 1 + 2 + 640 + 1 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12640095 and 12640104.

It is not an unprimeable number, because it can be changed into a prime (12640123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31722 + ... + 32117.

It is an arithmetic number, because the mean of its divisors is an integer number (1244880).

Almost surely, 2^12640122 is an apocalyptic number.

12640122 is an abundant number, since it is smaller than the sum of its proper divisors (17236998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12640122 is a wasteful number, since it uses less digits than its factorization.

12640122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63858 (or 63855 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 12640122 is about 3555.2949244753. The cubic root of 12640122 is about 232.9434063463.

Adding to 12640122 its reverse (22104621), we get a palindrome (34744743).

The spelling of 12640122 in words is "twelve million, six hundred forty thousand, one hundred twenty-two".