8199978 has 8 divisors (see below), whose sum is σ = 16399968. Its totient is φ = 2733324.

The previous prime is 8199943. The next prime is 8199979. The reversal of 8199978 is 8799918.

It is a sphenic number, since it is the product of 3 distinct primes.

8199978 is an admirable number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 8199978.

It is not an unprimeable number, because it can be changed into a prime (8199979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683326 + ... + 683337.

It is an arithmetic number, because the mean of its divisors is an integer number (2049996).

Almost surely, 2^8199978 is an apocalyptic number.

8199978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8199978 is a wasteful number, since it uses less digits than its factorization.

8199978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366668.

The product of its digits is 326592, while the sum is 51.

The square root of 8199978 is about 2863.5603712861. The cubic root of 8199978 is about 201.6527871816.

The spelling of 8199978 in words is "eight million, one hundred ninety-nine thousand, nine hundred seventy-eight".