813243 has 8 divisors (see below), whose sum is σ = 1089088. Its totient is φ = 539784.

The previous prime is 813227. The next prime is 813251. The reversal of 813243 is 342318.

It is a happy number.

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

It is not a de Polignac number, because 813243 - 2⁴ = 813227 is a prime.

It is a super-2 number, since 2×813243² = 1322728354098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813203) 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 7 ways as a sum of consecutive naturals, for example, 480 + ... + 1362.

It is an arithmetic number, because the mean of its divisors is an integer number (136136).

2⁸¹³²⁴³ is an apocalyptic number.

813243 is a deficient number, since it is larger than the sum of its proper divisors (275845).

813243 is a wasteful number, since it uses less digits than its factorization.

813243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193.

The product of its digits is 576, while the sum is 21.

The square root of 813243 is about 901.7998669328. The cubic root of 813243 is about 93.3412139037.

The spelling of 813243 in words is "eight hundred thirteen thousand, two hundred forty-three".