2871864 has 24 divisors (see below), whose sum is σ = 7778160. Its totient is φ = 957264.

The previous prime is 2871857. The next prime is 2871877. The reversal of 2871864 is 4681782.

2871864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 19872 + ... + 20015.

It is an arithmetic number, because the mean of its divisors is an integer number (324090).

2^2871864 is an apocalyptic number.

2871864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2871864 is an abundant number, since it is smaller than the sum of its proper divisors (4906296).

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

2871864 is a wasteful number, since it uses less digits than its factorization.

2871864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39899 (or 39892 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 2871864 is about 1694.6574875178. The cubic root of 2871864 is about 142.1416295057.

It can be divided in two parts, 28718 and 64, that added together give a palindrome (28782).

The spelling of 2871864 in words is "two million, eight hundred seventy-one thousand, eight hundred sixty-four".