2178938879 has 16 divisors (see below), whose sum is σ = 2450465472. Its totient is φ = 1922393088.

The previous prime is 2178938869. The next prime is 2178938903. The reversal of 2178938879 is 9788398712.

It is a cyclic number.

It is not a de Polignac number, because 2178938879 - 2⁴ = 2178938863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178938869) 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, 601277 + ... + 604889.

It is an arithmetic number, because the mean of its divisors is an integer number (153154092).

Almost surely, 2^2178938879 is an apocalyptic number.

2178938879 is a deficient number, since it is larger than the sum of its proper divisors (271526593).

2178938879 is a wasteful number, since it uses less digits than its factorization.

2178938879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666.

The product of its digits is 12192768, while the sum is 62.

The square root of 2178938879 is about 46679.1053791737. The cubic root of 2178938879 is about 1296.4278420837.

The spelling of 2178938879 in words is "two billion, one hundred seventy-eight million, nine hundred thirty-eight thousand, eight hundred seventy-nine".