8378421 has 16 divisors (see below), whose sum is σ = 11556864. Its totient is φ = 5395824.

The previous prime is 8378407. The next prime is 8378431. The reversal of 8378421 is 1248738.

It is not a de Polignac number, because 8378421 - 2⁵ = 8378389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8378431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13500 + ... + 14106.

It is an arithmetic number, because the mean of its divisors is an integer number (722304).

Almost surely, 2^8378421 is an apocalyptic number.

It is an amenable number.

8378421 is a deficient number, since it is larger than the sum of its proper divisors (3178443).

8378421 is a wasteful number, since it uses less digits than its factorization.

8378421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

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

The square root of 8378421 is about 2894.5502241281. The cubic root of 8378421 is about 203.1050521160.

The spelling of 8378421 in words is "eight million, three hundred seventy-eight thousand, four hundred twenty-one".