813966 has 8 divisors (see below), whose sum is σ = 1627944. Its totient is φ = 271320.

The previous prime is 813961. The next prime is 813971. The reversal of 813966 is 669318.

It is an interprime number because it is at equal distance from previous prime (813961) and next prime (813971).

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

813966 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67825 + ... + 67836.

It is an arithmetic number, because the mean of its divisors is an integer number (203493).

2⁸¹³⁹⁶⁶ is an apocalyptic number.

813966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813966 is a wasteful number, since it uses less digits than its factorization.

813966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135666.

The product of its digits is 7776, while the sum is 33.

The square root of 813966 is about 902.2006428727. The cubic root of 813966 is about 93.3688668556.

The spelling of 813966 in words is "eight hundred thirteen thousand, nine hundred sixty-six".