843649 has 2 divisors, whose sum is σ = 843650. Its totient is φ = 843648.

The previous prime is 843643. The next prime is 843677. The reversal of 843649 is 946348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552049 + 291600 = 743^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 843649 - 2⁹ = 843137 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (843643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421824 + 421825.

It is an arithmetic number, because the mean of its divisors is an integer number (421825).

2⁸⁴³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

843649 is a deficient number, since it is larger than the sum of its proper divisors (1).

843649 is an equidigital number, since it uses as much as digits as its factorization.

843649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 843649 is about 918.5036744619. The cubic root of 843649 is about 94.4903081613.

The spelling of 843649 in words is "eight hundred forty-three thousand, six hundred forty-nine".