813947 has 8 divisors (see below), whose sum is σ = 870144. Its totient is φ = 759528.

The previous prime is 813931. The next prime is 813961. The reversal of 813947 is 749318.

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 813947 - 2⁴ = 813931 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813947.

It is not an unprimeable number, because it can be changed into a prime (813907) 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, 578 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (108768).

2⁸¹³⁹⁴⁷ is an apocalyptic number.

813947 is a deficient number, since it is larger than the sum of its proper divisors (56197).

813947 is a wasteful number, since it uses less digits than its factorization.

813947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889.

The product of its digits is 6048, while the sum is 32.

The square root of 813947 is about 902.1901130028. The cubic root of 813947 is about 93.3681403624.

The spelling of 813947 in words is "eight hundred thirteen thousand, nine hundred forty-seven".