813949 has 4 divisors (see below), whose sum is σ = 821664. Its totient is φ = 806236.

The previous prime is 813931. The next prime is 813961. The reversal of 813949 is 949318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 949318 = 2 ⋅474659.

It is a cyclic number.

It is not a de Polignac number, because 813949 - 2¹³ = 805757 is a prime.

It is a Duffinian number.

813949 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813049) 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 3 ways as a sum of consecutive naturals, for example, 3697 + ... + 3910.

It is an arithmetic number, because the mean of its divisors is an integer number (205416).

2⁸¹³⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

813949 is a deficient number, since it is larger than the sum of its proper divisors (7715).

813949 is a wasteful number, since it uses less digits than its factorization.

813949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7714.

The product of its digits is 7776, while the sum is 34.

The square root of 813949 is about 902.1912214159. The cubic root of 813949 is about 93.3682168359.

The spelling of 813949 in words is "eight hundred thirteen thousand, nine hundred forty-nine".