8421878 has 16 divisors (see below), whose sum is σ = 12939264. Its totient is φ = 4110120.

The previous prime is 8421877. The next prime is 8421901. The reversal of 8421878 is 8781248.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17801 + ... + 18267.

It is an arithmetic number, because the mean of its divisors is an integer number (808704).

Almost surely, 2^8421878 is an apocalyptic number.

8421878 is a deficient number, since it is larger than the sum of its proper divisors (4517386).

8421878 is a wasteful number, since it uses less digits than its factorization.

8421878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667.

The product of its digits is 28672, while the sum is 38.

The square root of 8421878 is about 2902.0472084375. The cubic root of 8421878 is about 203.4556002679.

The spelling of 8421878 in words is "eight million, four hundred twenty-one thousand, eight hundred seventy-eight".