8421378 has 32 divisors (see below), whose sum is σ = 19700736. Its totient is φ = 2349648.

The previous prime is 8421251. The next prime is 8421403. The reversal of 8421378 is 8731248.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526 + ... + 4137.

It is an arithmetic number, because the mean of its divisors is an integer number (615648).

Almost surely, 2^8421378 is an apocalyptic number.

8421378 is an abundant number, since it is smaller than the sum of its proper divisors (11279358).

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

8421378 is a wasteful number, since it uses less digits than its factorization.

8421378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4718.

The product of its digits is 10752, while the sum is 33.

The square root of 8421378 is about 2901.9610610758. The cubic root of 8421378 is about 203.4515738575.

The spelling of 8421378 in words is "eight million, four hundred twenty-one thousand, three hundred seventy-eight".