391978796 has 24 divisors (see below), whose sum is σ = 750027600. Its totient is φ = 177766400.

The previous prime is 391978793. The next prime is 391978801. The reversal of 391978796 is 697879193.

It is not an unprimeable number, because it can be changed into a prime (391978793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9836 + ... + 29676.

It is an arithmetic number, because the mean of its divisors is an integer number (31251150).

Almost surely, 2^391978796 is an apocalyptic number.

It is an amenable number.

391978796 is a deficient number, since it is larger than the sum of its proper divisors (358048804).

391978796 is a wasteful number, since it uses less digits than its factorization.

391978796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20305 (or 20303 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 59.

The square root of 391978796 is about 19798.4543841180. The cubic root of 391978796 is about 731.8479458622.

The spelling of 391978796 in words is "three hundred ninety-one million, nine hundred seventy-eight thousand, seven hundred ninety-six".