12871818 has 32 divisors (see below), whose sum is σ = 28728000. Its totient is φ = 4272048.

The previous prime is 12871811. The next prime is 12871841. The reversal of 12871818 is 81817821.

It is not an unprimeable number, because it can be changed into a prime (12871811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18505 + ... + 19187.

It is an arithmetic number, because the mean of its divisors is an integer number (897750).

Almost surely, 2^12871818 is an apocalyptic number.

12871818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12871818 is an abundant number, since it is smaller than the sum of its proper divisors (15856182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12871818 is a wasteful number, since it uses less digits than its factorization.

12871818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043 (or 1037 counting only the distinct ones).

The product of its digits is 7168, while the sum is 36.

The square root of 12871818 is about 3587.7315953120. The cubic root of 12871818 is about 234.3580973410.

It can be divided in two parts, 12871 and 818, that added together give a square (13689 = 117²).

The spelling of 12871818 in words is "twelve million, eight hundred seventy-one thousand, eight hundred eighteen".