819949 has 4 divisors (see below), whose sum is σ = 883036. Its totient is φ = 756864.

The previous prime is 819943. The next prime is 819977. The reversal of 819949 is 949918.

819949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 949918 = 2 ⋅474959.

It can be written as a sum of positive squares in 2 ways, for example, as 42025 + 777924 = 205^2 + 882^2 .

It is a cyclic number.

It is not a de Polignac number, because 819949 - 2⁹ = 819437 is a prime.

It is a Duffinian number.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819943) 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, 31524 + ... + 31549.

It is an arithmetic number, because the mean of its divisors is an integer number (220759).

2⁸¹⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

819949 is a deficient number, since it is larger than the sum of its proper divisors (63087).

819949 is a wasteful number, since it uses less digits than its factorization.

819949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63086.

The product of its digits is 23328, while the sum is 40.

The square root of 819949 is about 905.5103533367. The cubic root of 819949 is about 93.5970757238.

The spelling of 819949 in words is "eight hundred nineteen thousand, nine hundred forty-nine".