8421424 has 40 divisors (see below), whose sum is σ = 18123840. Its totient is φ = 3758400.

The previous prime is 8421419. The next prime is 8421463. The reversal of 8421424 is 4241248.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9979 + ... + 10789.

It is an arithmetic number, because the mean of its divisors is an integer number (453096).

Almost surely, 2^8421424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8421424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9061920).

8421424 is an abundant number, since it is smaller than the sum of its proper divisors (9702416).

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

8421424 is a wasteful number, since it uses less digits than its factorization.

8421424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889 (or 883 counting only the distinct ones).

The product of its digits is 2048, while the sum is 25.

The square root of 8421424 is about 2901.9689867399. The cubic root of 8421424 is about 203.4519442939.

The spelling of 8421424 in words is "eight million, four hundred twenty-one thousand, four hundred twenty-four".