809949 has 8 divisors (see below), whose sum is σ = 1234240. Its totient is φ = 462816.

The previous prime is 809929. The next prime is 809981. The reversal of 809949 is 949908.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 809949 - 2⁵ = 809917 is a prime.

It is an Ulam number.

It is a Curzon number.

809949 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809909) 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 7 ways as a sum of consecutive naturals, for example, 19264 + ... + 19305.

It is an arithmetic number, because the mean of its divisors is an integer number (154280).

2⁸⁰⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

809949 is a deficient number, since it is larger than the sum of its proper divisors (424291).

809949 is a wasteful number, since it uses less digits than its factorization.

809949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38579.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 809949 is about 899.9716662207. The cubic root of 809949 is about 93.2150187319.

It can be divided in two parts, 80994 and 9, that added together give a triangular number (81003 = T₄₀₂).

The spelling of 809949 in words is "eight hundred nine thousand, nine hundred forty-nine".