2179843978 has 16 divisors (see below), whose sum is σ = 3603178656. Its totient is φ = 982684080.

The previous prime is 2179843969. The next prime is 2179843979. The reversal of 2179843978 is 8793489712.

2179843978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2179843979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 973768 + ... + 976003.

It is an arithmetic number, because the mean of its divisors is an integer number (225198666).

Almost surely, 2^2179843978 is an apocalyptic number.

2179843978 is a deficient number, since it is larger than the sum of its proper divisors (1423334678).

2179843978 is a wasteful number, since it uses less digits than its factorization.

2179843978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949829.

The product of its digits is 6096384, while the sum is 58.

The square root of 2179843978 is about 46688.7992777711. The cubic root of 2179843978 is about 1296.6073228885.

The spelling of 2179843978 in words is "two billion, one hundred seventy-nine million, eight hundred forty-three thousand, nine hundred seventy-eight".