8421776 has 40 divisors (see below), whose sum is σ = 18004800. Its totient is φ = 3784320.

The previous prime is 8421773. The next prime is 8421779. The reversal of 8421776 is 6771248.

It is a happy number.

8421776 is nontrivially palindromic in base 15.

It is an interprime number because it is at equal distance from previous prime (8421773) and next prime (8421779).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18965 + ... + 19403.

It is an arithmetic number, because the mean of its divisors is an integer number (450120).

Almost surely, 2^8421776 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 8421776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9002400).

8421776 is an abundant number, since it is smaller than the sum of its proper divisors (9583024).

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

8421776 is a wasteful number, since it uses less digits than its factorization.

8421776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 561 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 8421776 is about 2902.0296345834. The cubic root of 8421776 is about 203.4547788931.

The spelling of 8421776 in words is "eight million, four hundred twenty-one thousand, seven hundred seventy-six".