8447978 has 24 divisors (see below), whose sum is σ = 15921696. Its totient is φ = 3290760.

The previous prime is 8447977. The next prime is 8447981. The reversal of 8447978 is 8797448.

8447978 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

8447978 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (8447977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 800 + ... + 4187.

It is an arithmetic number, because the mean of its divisors is an integer number (663404).

Almost surely, 2^8447978 is an apocalyptic number.

8447978 is a deficient number, since it is larger than the sum of its proper divisors (7473718).

8447978 is a wasteful number, since it uses less digits than its factorization.

8447978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018 (or 5007 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 8447978 is about 2906.5405553682. The cubic root of 8447978 is about 203.6655579931.

The spelling of 8447978 in words is "eight million, four hundred forty-seven thousand, nine hundred seventy-eight".