8163978 has 16 divisors (see below), whose sum is σ = 17288640. Its totient is φ = 2561216.

The previous prime is 8163971. The next prime is 8163983. The reversal of 8163978 is 8793618.

It is not an unprimeable number, because it can be changed into a prime (8163971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39918 + ... + 40121.

It is an arithmetic number, because the mean of its divisors is an integer number (1080540).

Almost surely, 2^8163978 is an apocalyptic number.

8163978 is an abundant number, since it is smaller than the sum of its proper divisors (9124662).

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

8163978 is a wasteful number, since it uses less digits than its factorization.

8163978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80061.

The product of its digits is 72576, while the sum is 42.

The square root of 8163978 is about 2857.2675758493. The cubic root of 8163978 is about 201.3572518353.

The spelling of 8163978 in words is "eight million, one hundred sixty-three thousand, nine hundred seventy-eight".