813903 has 16 divisors (see below), whose sum is σ = 1161600. Its totient is φ = 505440.

The previous prime is 813893. The next prime is 813907. The reversal of 813903 is 309318.

It is not a de Polignac number, because 813903 - 2⁵ = 813871 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813903.

It is not an unprimeable number, because it can be changed into a prime (813907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6148 + ... + 6278.

It is an arithmetic number, because the mean of its divisors is an integer number (72600).

2⁸¹³⁹⁰³ is an apocalyptic number.

813903 is a deficient number, since it is larger than the sum of its proper divisors (347697).

813903 is a wasteful number, since it uses less digits than its factorization.

813903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 813903 is about 902.1657275689. The cubic root of 813903 is about 93.3664579137.

The spelling of 813903 in words is "eight hundred thirteen thousand, nine hundred three".