813853 has 4 divisors (see below), whose sum is σ = 816480. Its totient is φ = 811228.

The previous prime is 813847. The next prime is 813863. The reversal of 813853 is 358318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813833) 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, 775 + ... + 1492.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

2⁸¹³⁸⁵³ is an apocalyptic number.

It is an amenable number.

813853 is a deficient number, since it is larger than the sum of its proper divisors (2627).

813853 is a wasteful number, since it uses less digits than its factorization.

813853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626.

The product of its digits is 2880, while the sum is 28.

The square root of 813853 is about 902.1380160485. The cubic root of 813853 is about 93.3645459666.

Subtracting from 813853 its reverse (358318), we obtain a triangular number (455535 = T₉₅₄).

It can be divided in two parts, 8 and 13853, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 813853 in words is "eight hundred thirteen thousand, eight hundred fifty-three".