12887109 has 12 divisors (see below), whose sum is σ = 18966636. Its totient is φ = 8428992.

The previous prime is 12887101. The next prime is 12887113. The reversal of 12887109 is 90178821.

It can be written as a sum of positive squares in 2 ways, for example, as 11410884 + 1476225 = 3378^2 + 1215^2 .

It is not a de Polignac number, because 12887109 - 2³ = 12887101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12887101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13032 + ... + 13985.

It is an arithmetic number, because the mean of its divisors is an integer number (1580553).

Almost surely, 2^12887109 is an apocalyptic number.

It is an amenable number.

12887109 is a deficient number, since it is larger than the sum of its proper divisors (6079527).

12887109 is a wasteful number, since it uses less digits than its factorization.

12887109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27076 (or 27073 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 12887109 is about 3589.8619750626. The cubic root of 12887109 is about 234.4508620558.

It can be divided in two parts, 12887 and 109, that added together give a square (12996 = 114²).

The spelling of 12887109 in words is "twelve million, eight hundred eighty-seven thousand, one hundred nine".