12690556 has 24 divisors (see below), whose sum is σ = 24014480. Its totient is φ = 5847552.

The previous prime is 12690553. The next prime is 12690571. The reversal of 12690556 is 65509621.

It is a happy number.

It is a super-2 number, since 2×12690556² = 322100423178272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12690553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556 + ... + 5068.

Almost surely, 2^12690556 is an apocalyptic number.

It is an amenable number.

12690556 is a deficient number, since it is larger than the sum of its proper divisors (11323924).

12690556 is a wasteful number, since it uses less digits than its factorization.

12690556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4573 (or 4571 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 12690556 is about 3562.3806646679. The cubic root of 12690556 is about 233.2528094024.

The spelling of 12690556 in words is "twelve million, six hundred ninety thousand, five hundred fifty-six".