2179879 has 4 divisors (see below), whose sum is σ = 2347576. Its totient is φ = 2012184.

The previous prime is 2179867. The next prime is 2179897. The reversal of 2179879 is 9789712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2179879 - 2⁹ = 2179367 is a prime.

It is a Duffinian number.

2179879 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2179819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83829 + ... + 83854.

It is an arithmetic number, because the mean of its divisors is an integer number (586894).

2^2179879 is an apocalyptic number.

2179879 is a deficient number, since it is larger than the sum of its proper divisors (167697).

2179879 is a wasteful number, since it uses less digits than its factorization.

2179879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167696.

The product of its digits is 63504, while the sum is 43.

The square root of 2179879 is about 1476.4413296843. The cubic root of 2179879 is about 129.6614266740.

The spelling of 2179879 in words is "two million, one hundred seventy-nine thousand, eight hundred seventy-nine".