8399978 has 4 divisors (see below), whose sum is σ = 12599970. Its totient is φ = 4199988.

The previous prime is 8399953. The next prime is 8399987. The reversal of 8399978 is 8799938.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7856809 + 543169 = 2803^2 + 737^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2099993 + ... + 2099996.

Almost surely, 2^8399978 is an apocalyptic number.

8399978 is a deficient number, since it is larger than the sum of its proper divisors (4199992).

8399978 is a wasteful number, since it uses less digits than its factorization.

8399978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4199991.

The product of its digits is 979776, while the sum is 53.

The square root of 8399978 is about 2898.2715538748. The cubic root of 8399978 is about 203.2790938968.

The spelling of 8399978 in words is "eight million, three hundred ninety-nine thousand, nine hundred seventy-eight".