12887641 has 4 divisors (see below), whose sum is σ = 13879012. Its totient is φ = 11896272.

The previous prime is 12887627. The next prime is 12887657. The reversal of 12887641 is 14678821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2673225 + 10214416 = 1635^2 + 3196^2 .

It is a cyclic number.

It is not a de Polignac number, because 12887641 - 2²¹ = 10790489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12887641.

It is not an unprimeable number, because it can be changed into a prime (12887621) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 495666 + ... + 495691.

It is an arithmetic number, because the mean of its divisors is an integer number (3469753).

Almost surely, 2^12887641 is an apocalyptic number.

It is an amenable number.

12887641 is a deficient number, since it is larger than the sum of its proper divisors (991371).

12887641 is an equidigital number, since it uses as much as digits as its factorization.

12887641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991370.

The product of its digits is 21504, while the sum is 37.

The square root of 12887641 is about 3589.9360718542. The cubic root of 12887641 is about 234.4540881774.

The spelling of 12887641 in words is "twelve million, eight hundred eighty-seven thousand, six hundred forty-one".