813923 has 8 divisors (see below), whose sum is σ = 903216. Its totient is φ = 727200.

The previous prime is 813907. The next prime is 813931. The reversal of 813923 is 329318.

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 813923 - 2⁴ = 813907 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 813892 and 813901.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813923.

It is not an unprimeable number, because it can be changed into a prime (813023) 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, 65 + ... + 1277.

It is an arithmetic number, because the mean of its divisors is an integer number (112902).

2⁸¹³⁹²³ is an apocalyptic number.

813923 is a deficient number, since it is larger than the sum of its proper divisors (89293).

813923 is a wasteful number, since it uses less digits than its factorization.

813923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285.

The product of its digits is 1296, while the sum is 26.

The square root of 813923 is about 902.1768119388. The cubic root of 813923 is about 93.3672226706.

It can be divided in two parts, 81 and 3923, that added together give a palindrome (4004).

The spelling of 813923 in words is "eight hundred thirteen thousand, nine hundred twenty-three".