849649 has 2 divisors, whose sum is σ = 849650. Its totient is φ = 849648.

The previous prime is 849601. The next prime is 849691. The reversal of 849649 is 946948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 846400 + 3249 = 920^2 + 57^2 .

It is a cyclic number.

It is not a de Polignac number, because 849649 - 2¹¹ = 847601 is a prime.

It is not a weakly prime, because it can be changed into another prime (849049) 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 as a sum of consecutive naturals, namely, 424824 + 424825.

It is an arithmetic number, because the mean of its divisors is an integer number (424825).

2⁸⁴⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

849649 is a deficient number, since it is larger than the sum of its proper divisors (1).

849649 is an equidigital number, since it uses as much as digits as its factorization.

849649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 849649 is about 921.7640695970. The cubic root of 849649 is about 94.7137830547.

The spelling of 849649 in words is "eight hundred forty-nine thousand, six hundred forty-nine".