1978880984 has 16 divisors (see below), whose sum is σ = 3796690920. Its totient is φ = 966430080.

The previous prime is 1978880947. The next prime is 1978880987. The reversal of 1978880984 is 4890888791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978880987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2875937 + ... + 2876624.

Almost surely, 2^1978880984 is an apocalyptic number.

It is an amenable number.

1978880984 is a deficient number, since it is larger than the sum of its proper divisors (1817809936).

1978880984 is a wasteful number, since it uses less digits than its factorization.

1978880984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5752610 (or 5752606 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 62.

The square root of 1978880984 is about 44484.6151382700. The cubic root of 1978880984 is about 1255.4706327342.

The spelling of 1978880984 in words is "one billion, nine hundred seventy-eight million, eight hundred eighty thousand, nine hundred eighty-four".