843648421 has 24 divisors (see below), whose sum is σ = 1065838592. Its totient is φ = 653637600.

The previous prime is 843648413. The next prime is 843648457. The reversal of 843648421 is 124846348.

It is a happy number.

It is not a de Polignac number, because 843648421 - 2³ = 843648413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (843648521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150556 + ... + 156058.

Almost surely, 2^843648421 is an apocalyptic number.

It is an amenable number.

843648421 is a deficient number, since it is larger than the sum of its proper divisors (222190171).

843648421 is a wasteful number, since it uses less digits than its factorization.

843648421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713 (or 5702 counting only the distinct ones).

The product of its digits is 147456, while the sum is 40.

The square root of 843648421 is about 29045.6265382587. The cubic root of 843648421 is about 944.9028654488.

The spelling of 843648421 in words is "eight hundred forty-three million, six hundred forty-eight thousand, four hundred twenty-one".