2187867 has 16 divisors (see below), whose sum is σ = 3209472. Its totient is φ = 1314720.

The previous prime is 2187863. The next prime is 2187877. The reversal of 2187867 is 7687812.

It is not a de Polignac number, because 2187867 - 2² = 2187863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2187863) 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, 5313 + ... + 5709.

It is an arithmetic number, because the mean of its divisors is an integer number (200592).

2^2187867 is an apocalyptic number.

2187867 is a deficient number, since it is larger than the sum of its proper divisors (1021605).

2187867 is a wasteful number, since it uses less digits than its factorization.

2187867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578.

The product of its digits is 37632, while the sum is 39.

The square root of 2187867 is about 1479.1440092161. The cubic root of 2187867 is about 129.8196117416.

Subtracting 2187867 from its reverse (7687812), we obtain a palindrome (5499945).

It can be divided in two parts, 21878 and 67, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 2187867 in words is "two million, one hundred eighty-seven thousand, eight hundred sixty-seven".