7931978 has 16 divisors (see below), whose sum is σ = 12229056. Its totient is φ = 3857280.

The previous prime is 7931977. The next prime is 7932011. The reversal of 7931978 is 8791397.

It is not an unprimeable number, because it can be changed into a prime (7931977) 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, 11450 + ... + 12122.

It is an arithmetic number, because the mean of its divisors is an integer number (764316).

Almost surely, 2^7931978 is an apocalyptic number.

7931978 is a deficient number, since it is larger than the sum of its proper divisors (4297078).

7931978 is a wasteful number, since it uses less digits than its factorization.

7931978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829.

The product of its digits is 95256, while the sum is 44.

The square root of 7931978 is about 2816.3767503656. The cubic root of 7931978 is about 199.4315357729.

It can be divided in two parts, 79319 and 78, that added together give a palindrome (79397).

The spelling of 7931978 in words is "seven million, nine hundred thirty-one thousand, nine hundred seventy-eight".