2871855 has 40 divisors (see below), whose sum is σ = 5889312. Its totient is φ = 1311552.

The previous prime is 2871853. The next prime is 2871857. The reversal of 2871855 is 5581782.

It is an interprime number because it is at equal distance from previous prime (2871853) and next prime (2871857).

It is not a de Polignac number, because 2871855 - 2¹ = 2871853 is a prime.

It is a super-2 number, since 2×2871855² = 16495102282050, which contains 22 as substring.

2871855 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2871853) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 2329 + ... + 3341.

2^2871855 is an apocalyptic number.

2871855 is an abundant number, since it is smaller than the sum of its proper divisors (3017457).

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

2871855 is a wasteful number, since it uses less digits than its factorization.

2871855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1028 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 2871855 is about 1694.6548321118. The cubic root of 2871855 is about 142.1414810219.

The spelling of 2871855 in words is "two million, eight hundred seventy-one thousand, eight hundred fifty-five".