12591638 has 8 divisors (see below), whose sum is σ = 18905832. Its totient is φ = 6289696.

The previous prime is 12591617. The next prime is 12591643. The reversal of 12591638 is 83619521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 12591598 and 12591607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206 + ... + 5022.

It is an arithmetic number, because the mean of its divisors is an integer number (2363229).

Almost surely, 2^12591638 is an apocalyptic number.

12591638 is a deficient number, since it is larger than the sum of its proper divisors (6314194).

12591638 is a wasteful number, since it uses less digits than its factorization.

12591638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6126.

The product of its digits is 12960, while the sum is 35.

The square root of 12591638 is about 3548.4698110594. The cubic root of 12591638 is about 232.6451893086.

The spelling of 12591638 in words is "twelve million, five hundred ninety-one thousand, six hundred thirty-eight".