12506643 has 20 divisors (see below), whose sum is σ = 19006680. Its totient is φ = 8193312.

The previous prime is 12506587. The next prime is 12506651. The reversal of 12506643 is 34660521.

12506643 is a `hidden beast` number, since 12 + 5 + 0 + 6 + 643 = 666.

12506643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12506643 - 2⁸ = 12506387 is a prime.

It is a super-2 number, since 2×12506643² = 312832238258898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12502643) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3471 + ... + 6087.

It is an arithmetic number, because the mean of its divisors is an integer number (950334).

Almost surely, 2^12506643 is an apocalyptic number.

12506643 is a deficient number, since it is larger than the sum of its proper divisors (6500037).

12506643 is an equidigital number, since it uses as much as digits as its factorization.

12506643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688 (or 2679 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 12506643 is about 3536.4732432184. The cubic root of 12506643 is about 232.1205464994.

The spelling of 12506643 in words is "twelve million, five hundred six thousand, six hundred forty-three".