8421784461 has 16 divisors (see below), whose sum is σ = 12571965120. Its totient is φ = 5571661680.

The previous prime is 8421784453. The next prime is 8421784499. The reversal of 8421784461 is 1644871248.

It is not a de Polignac number, because 8421784461 - 2³ = 8421784453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421784361) 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, 1186990 + ... + 1194063.

It is an arithmetic number, because the mean of its divisors is an integer number (785747820).

Almost surely, 2^8421784461 is an apocalyptic number.

It is an amenable number.

8421784461 is a deficient number, since it is larger than the sum of its proper divisors (4150180659).

8421784461 is a wasteful number, since it uses less digits than its factorization.

8421784461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381193 (or 2381187 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 8421784461 is about 91770.2809247090. The cubic root of 8421784461 is about 2034.5484702723.

The spelling of 8421784461 in words is "eight billion, four hundred twenty-one million, seven hundred eighty-four thousand, four hundred sixty-one".