2178439804 has 12 divisors (see below), whose sum is σ = 3832230528. Its totient is φ = 1083516800.

The previous prime is 2178439771. The next prime is 2178439807. The reversal of 2178439804 is 4089348712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178439807) 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, 1424917 + ... + 1426444.

It is an arithmetic number, because the mean of its divisors is an integer number (319352544).

Almost surely, 2^2178439804 is an apocalyptic number.

It is an amenable number.

2178439804 is a deficient number, since it is larger than the sum of its proper divisors (1653790724).

2178439804 is a wasteful number, since it uses less digits than its factorization.

2178439804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851556 (or 2851554 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 2178439804 is about 46673.7592657802. The cubic root of 2178439804 is about 1296.3288544318.

The spelling of 2178439804 in words is "two billion, one hundred seventy-eight million, four hundred thirty-nine thousand, eight hundred four".