843954421 has 4 divisors (see below), whose sum is σ = 863581312. Its totient is φ = 824327532.

The previous prime is 843954401. The next prime is 843954437. The reversal of 843954421 is 124459348.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 843954421 - 2⁵ = 843954389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (843954401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9813381 + ... + 9813466.

It is an arithmetic number, because the mean of its divisors is an integer number (215895328).

Almost surely, 2^843954421 is an apocalyptic number.

It is an amenable number.

843954421 is a deficient number, since it is larger than the sum of its proper divisors (19626891).

843954421 is a wasteful number, since it uses less digits than its factorization.

843954421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19626890.

The product of its digits is 138240, while the sum is 40.

The square root of 843954421 is about 29050.8936351363. The cubic root of 843954421 is about 945.0170936505.

The spelling of 843954421 in words is "eight hundred forty-three million, nine hundred fifty-four thousand, four hundred twenty-one".