263813 has 8 divisors (see below), whose sum is σ = 298080. Its totient is φ = 231280.

The previous prime is 263803. The next prime is 263819. The reversal of 263813 is 318362.

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 263813 - 2¹² = 259717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95 + ... + 732.

It is an arithmetic number, because the mean of its divisors is an integer number (37260).

2²⁶³⁸¹³ is an apocalyptic number.

It is an amenable number.

263813 is a deficient number, since it is larger than the sum of its proper divisors (34267).

263813 is a wasteful number, since it uses less digits than its factorization.

263813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867.

The product of its digits is 864, while the sum is 23.

The square root of 263813 is about 513.6272967824. The cubic root of 263813 is about 64.1355363323.

The spelling of 263813 in words is "two hundred sixty-three thousand, eight hundred thirteen".