12690505 has 4 divisors (see below), whose sum is σ = 15228612. Its totient is φ = 10152400.

The previous prime is 12690473. The next prime is 12690511. The reversal of 12690505 is 50509621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5308416 + 7382089 = 2304^2 + 2717^2 .

It is not a de Polignac number, because 12690505 - 2⁵ = 12690473 is a prime.

It is a super-2 number, since 2×12690505² = 322097834310050, which contains 22 as substring.

It is a Duffinian 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, 1269046 + ... + 1269055.

It is an arithmetic number, because the mean of its divisors is an integer number (3807153).

Almost surely, 2^12690505 is an apocalyptic number.

It is an amenable number.

12690505 is a deficient number, since it is larger than the sum of its proper divisors (2538107).

12690505 is an equidigital number, since it uses as much as digits as its factorization.

12690505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538106.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 12690505 is about 3562.3735065262. The cubic root of 12690505 is about 233.2524969414.

The spelling of 12690505 in words is "twelve million, six hundred ninety thousand, five hundred five".