12689943 has 32 divisors (see below), whose sum is σ = 20262912. Its totient is φ = 6912000.

The previous prime is 12689923. The next prime is 12689969. The reversal of 12689943 is 34998621.

It is a de Polignac number, because none of the positive numbers 2^k-12689943 is a prime.

It is a super-2 number, since 2×12689943² = 322069306686498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12689895 and 12689904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65655 + ... + 65847.

It is an arithmetic number, because the mean of its divisors is an integer number (633216).

Almost surely, 2^12689943 is an apocalyptic number.

12689943 is a deficient number, since it is larger than the sum of its proper divisors (7572969).

12689943 is a wasteful number, since it uses less digits than its factorization.

12689943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335.

The product of its digits is 93312, while the sum is 42.

The square root of 12689943 is about 3562.2946256591. The cubic root of 12689943 is about 233.2490536890.

It can be divided in two parts, 1268 and 9943, that added together give a palindrome (11211).

The spelling of 12689943 in words is "twelve million, six hundred eighty-nine thousand, nine hundred forty-three".