12640522 has 4 divisors (see below), whose sum is σ = 18960786. Its totient is φ = 6320260.

The previous prime is 12640517. The next prime is 12640531. The reversal of 12640522 is 22504621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8755681 + 3884841 = 2959^2 + 1971^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 12640493 and 12640502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3160129 + ... + 3160132.

Almost surely, 2^12640522 is an apocalyptic number.

12640522 is a deficient number, since it is larger than the sum of its proper divisors (6320264).

12640522 is an equidigital number, since it uses as much as digits as its factorization.

12640522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6320263.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 12640522 is about 3555.3511781539. The cubic root of 12640522 is about 232.9458635055.

The spelling of 12640522 in words is "twelve million, six hundred forty thousand, five hundred twenty-two".