12690443 has 4 divisors (see below), whose sum is σ = 13000008. Its totient is φ = 12380880.

The previous prime is 12690437. The next prime is 12690463. The reversal of 12690443 is 34409621.

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

It is a cyclic number.

It is not a de Polignac number, because 12690443 - 2⁴ = 12690427 is a prime.

It is a super-2 number, since 2×12690443² = 322094687072498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12690463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154721 + ... + 154802.

It is an arithmetic number, because the mean of its divisors is an integer number (3250002).

Almost surely, 2^12690443 is an apocalyptic number.

12690443 is a deficient number, since it is larger than the sum of its proper divisors (309565).

12690443 is an equidigital number, since it uses as much as digits as its factorization.

12690443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309564.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 12690443 is about 3562.3648044522. The cubic root of 12690443 is about 233.2521170858.

The spelling of 12690443 in words is "twelve million, six hundred ninety thousand, four hundred forty-three".