8421380 has 48 divisors (see below), whose sum is σ = 19535040. Its totient is φ = 3024000.

The previous prime is 8421251. The next prime is 8421403. The reversal of 8421380 is 831248.

It is a super-2 number, since 2×8421380² = 141839282208800, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8⁵ + 4¹¹ + 2²¹ + 1 + 3 + 8⁷ + 0 .

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, 22031 + ... + 22409.

It is an arithmetic number, because the mean of its divisors is an integer number (406980).

Almost surely, 2^8421380 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 8421380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9767520).

8421380 is an abundant number, since it is smaller than the sum of its proper divisors (11113660).

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

8421380 is a wasteful number, since it uses less digits than its factorization.

8421380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 8421380 is about 2901.9614056703. The cubic root of 8421380 is about 203.4515899634.

It can be divided in two parts, 842 and 1380, that added together give a palindrome (2222).

The spelling of 8421380 in words is "eight million, four hundred twenty-one thousand, three hundred eighty".