1978844018 has 8 divisors (see below), whose sum is σ = 3064016640. Its totient is φ = 957505140.

The previous prime is 1978843969. The next prime is 1978844033. The reversal of 1978844018 is 8104488791.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15958358 + ... + 15958481.

It is an arithmetic number, because the mean of its divisors is an integer number (383002080).

Almost surely, 2^1978844018 is an apocalyptic number.

1978844018 is a deficient number, since it is larger than the sum of its proper divisors (1085172622).

1978844018 is a wasteful number, since it uses less digits than its factorization.

1978844018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31916872.

The product of its (nonzero) digits is 516096, while the sum is 50.

The square root of 1978844018 is about 44484.1996443681. The cubic root of 1978844018 is about 1255.4628151819.

The spelling of 1978844018 in words is "one billion, nine hundred seventy-eight million, eight hundred forty-four thousand, eighteen".