12643940 has 24 divisors (see below), whose sum is σ = 27119232. Its totient is φ = 4949600.

The previous prime is 12643933. The next prime is 12643999. The reversal of 12643940 is 4934621.

It is an unprimeable number.

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, 5786 + ... + 7665.

It is an arithmetic number, because the mean of its divisors is an integer number (1129968).

Almost surely, 2^12643940 is an apocalyptic number.

12643940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643940 is an abundant number, since it is smaller than the sum of its proper divisors (14475292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12643940 is a wasteful number, since it uses less digits than its factorization.

12643940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13507 (or 13505 counting only the distinct ones).

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

The square root of 12643940 is about 3555.8318295442. The cubic root of 12643940 is about 232.9668578180.

The spelling of 12643940 in words is "twelve million, six hundred forty-three thousand, nine hundred forty".