1978347996 has 24 divisors (see below), whose sum is σ = 5129050640. Its totient is φ = 659449296.

The previous prime is 1978347991. The next prime is 1978348003. The reversal of 1978347996 is 6997438791.

1978347996 is a `hidden beast` number, since 1 + 9 + 78 + 3 + 479 + 96 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978347991) 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 7 ways as a sum of consecutive naturals, for example, 9158911 + ... + 9159126.

Almost surely, 2^1978347996 is an apocalyptic number.

It is an amenable number.

1978347996 is an abundant number, since it is smaller than the sum of its proper divisors (3150702644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1978347996 is a wasteful number, since it uses less digits than its factorization.

1978347996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18318050 (or 18318042 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 1978347996 is about 44478.6240344730. The cubic root of 1978347996 is about 1255.3579072643.

The spelling of 1978347996 in words is "one billion, nine hundred seventy-eight million, three hundred forty-seven thousand, nine hundred ninety-six".