12987705 has 8 divisors (see below), whose sum is σ = 20780352. Its totient is φ = 6926768.

The previous prime is 12987647. The next prime is 12987707. The reversal of 12987705 is 50778921.

12987705 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12987705 - 2⁷ = 12987577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12987707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432909 + ... + 432938.

It is an arithmetic number, because the mean of its divisors is an integer number (2597544).

Almost surely, 2^12987705 is an apocalyptic number.

12987705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12987705 is a deficient number, since it is larger than the sum of its proper divisors (7792647).

12987705 is an equidigital number, since it uses as much as digits as its factorization.

12987705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865855.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 12987705 is about 3603.8458624087. The cubic root of 12987705 is about 235.0593180574.

The spelling of 12987705 in words is "twelve million, nine hundred eighty-seven thousand, seven hundred five".