12871605 has 16 divisors (see below), whose sum is σ = 21490560. Its totient is φ = 6566208.

The previous prime is 12871591. The next prime is 12871613. The reversal of 12871605 is 50617821.

It is not a de Polignac number, because 12871605 - 2¹² = 12867509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18310 + ... + 18999.

It is an arithmetic number, because the mean of its divisors is an integer number (1343160).

Almost surely, 2^12871605 is an apocalyptic number.

12871605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12871605 is a deficient number, since it is larger than the sum of its proper divisors (8618955).

12871605 is a wasteful number, since it uses less digits than its factorization.

12871605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37340.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 12871605 is about 3587.7019106944. The cubic root of 12871605 is about 234.3568046319.

It can be divided in two parts, 1 and 2871605, that added together give a triangular number (2871606 = T₂₃₉₆).

The spelling of 12871605 in words is "twelve million, eight hundred seventy-one thousand, six hundred five".