8678421 has 20 divisors (see below), whose sum is σ = 13648800. Its totient is φ = 5480136.

The previous prime is 8678399. The next prime is 8678447. The reversal of 8678421 is 1248768.

It is not a de Polignac number, because 8678421 - 2¹⁰ = 8677397 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

8678421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8678821) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1281 + ... + 4358.

It is an arithmetic number, because the mean of its divisors is an integer number (682440).

Almost surely, 2^8678421 is an apocalyptic number.

8678421 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8678421 is a deficient number, since it is larger than the sum of its proper divisors (4970379).

8678421 is a wasteful number, since it uses less digits than its factorization.

8678421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5670 (or 5661 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 8678421 is about 2945.9159865821. The cubic root of 8678421 is about 205.5008258265.

The spelling of 8678421 in words is "eight million, six hundred seventy-eight thousand, four hundred twenty-one".