855949 has 4 divisors (see below), whose sum is σ = 860860. Its totient is φ = 851040.

The previous prime is 855947. The next prime is 855983. The reversal of 855949 is 949558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 949558 = 2 ⋅474779.

It can be written as a sum of positive squares in 2 ways, for example, as 13225 + 842724 = 115^2 + 918^2 .

It is a cyclic number.

It is not a de Polignac number, because 855949 - 2¹ = 855947 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855947) 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 in 3 ways as a sum of consecutive naturals, for example, 2184 + ... + 2545.

It is an arithmetic number, because the mean of its divisors is an integer number (215215).

2⁸⁵⁵⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

855949 is a deficient number, since it is larger than the sum of its proper divisors (4911).

855949 is a wasteful number, since it uses less digits than its factorization.

855949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910.

The product of its digits is 64800, while the sum is 40.

The square root of 855949 is about 925.1751185586. The cubic root of 855949 is about 94.9473022599.

The spelling of 855949 in words is "eight hundred fifty-five thousand, nine hundred forty-nine".