843489421 has 4 divisors (see below), whose sum is σ = 843902332. Its totient is φ = 843076512.

The previous prime is 843489359. The next prime is 843489463. The reversal of 843489421 is 124984348.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 291897225 + 551592196 = 17085^2 + 23486^2 .

It is a cyclic number.

It is not a de Polignac number, because 843489421 - 2⁷ = 843489293 is a prime.

It is a super-2 number, since 2×843489421² = 1422948806677830482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (843489121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203376 + ... + 207481.

It is an arithmetic number, because the mean of its divisors is an integer number (210975583).

Almost surely, 2^843489421 is an apocalyptic number.

It is an amenable number.

843489421 is a deficient number, since it is larger than the sum of its proper divisors (412911).

843489421 is a wasteful number, since it uses less digits than its factorization.

843489421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412910.

The product of its digits is 221184, while the sum is 43.

The square root of 843489421 is about 29042.8893362902. The cubic root of 843489421 is about 944.8435006743.

The spelling of 843489421 in words is "eight hundred forty-three million, four hundred eighty-nine thousand, four hundred twenty-one".