849861 has 12 divisors (see below), whose sum is σ = 1242540. Its totient is φ = 559680.

The previous prime is 849857. The next prime is 849869. The reversal of 849861 is 168948.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 352836 + 497025 = 594^2 + 705^2 .

It is not a de Polignac number, because 849861 - 2² = 849857 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 849861.

It is not an unprimeable number, because it can be changed into a prime (849869) 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 11 ways as a sum of consecutive naturals, for example, 271 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (103545).

2⁸⁴⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

849861 is a deficient number, since it is larger than the sum of its proper divisors (392679).

849861 is a wasteful number, since it uses less digits than its factorization.

849861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1153 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 849861 is about 921.8790593131. The cubic root of 849861 is about 94.7216598965.

The spelling of 849861 in words is "eight hundred forty-nine thousand, eight hundred sixty-one".