8219978 has 8 divisors (see below), whose sum is σ = 13278468. Its totient is φ = 3793824.

The previous prime is 8219969. The next prime is 8219983. The reversal of 8219978 is 8799128.

It can be written as a sum of positive squares in 2 ways, for example, as 8219689 + 289 = 2867^2 + 17^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158051 + ... + 158102.

Almost surely, 2^8219978 is an apocalyptic number.

8219978 is a deficient number, since it is larger than the sum of its proper divisors (5058490).

8219978 is a wasteful number, since it uses less digits than its factorization.

8219978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316168.

The product of its digits is 72576, while the sum is 44.

The square root of 8219978 is about 2867.0504006731. The cubic root of 8219978 is about 201.8165998676.

The spelling of 8219978 in words is "eight million, two hundred nineteen thousand, nine hundred seventy-eight".