813917873 has 8 divisors (see below), whose sum is σ = 832372200. Its totient is φ = 795578368.

The previous prime is 813917851. The next prime is 813917903. The reversal of 813917873 is 378719318.

It can be written as a sum of positive squares in 4 ways, for example, as 33721249 + 780196624 = 5807^2 + 27932^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 813917873 - 2¹⁰ = 813916849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813910873) 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, 14288 + ... + 42801.

It is an arithmetic number, because the mean of its divisors is an integer number (104046525).

Almost surely, 2^813917873 is an apocalyptic number.

It is an amenable number.

813917873 is a deficient number, since it is larger than the sum of its proper divisors (18454327).

813917873 is a wasteful number, since it uses less digits than its factorization.

813917873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57411.

The product of its digits is 254016, while the sum is 47.

The square root of 813917873 is about 28529.2459241390. The cubic root of 813917873 is about 933.6702662637.

The spelling of 813917873 in words is "eight hundred thirteen million, nine hundred seventeen thousand, eight hundred seventy-three".