2181879 has 24 divisors (see below), whose sum is σ = 3669120. Its totient is φ = 1223568.

The previous prime is 2181871. The next prime is 2181889. The reversal of 2181879 is 9781812.

2181879 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2181879 - 2³ = 2181871 is a prime.

2181879 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3424 + ... + 4010.

It is an arithmetic number, because the mean of its divisors is an integer number (152880).

2^2181879 is an apocalyptic number.

2181879 is a deficient number, since it is larger than the sum of its proper divisors (1487241).

2181879 is a wasteful number, since it uses less digits than its factorization.

2181879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 656 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 2181879 is about 1477.1184786604. The cubic root of 2181879 is about 129.7010685663.

The spelling of 2181879 in words is "two million, one hundred eighty-one thousand, eight hundred seventy-nine".