263903 has 4 divisors (see below), whose sum is σ = 272448. Its totient is φ = 255360.

The previous prime is 263899. The next prime is 263909. The reversal of 263903 is 309362.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309362 = 2 ⋅154681.

It is a cyclic number.

It is not a de Polignac number, because 263903 - 2² = 263899 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 (263909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4226 + ... + 4287.

It is an arithmetic number, because the mean of its divisors is an integer number (68112).

2²⁶³⁹⁰³ is an apocalyptic number.

263903 is a deficient number, since it is larger than the sum of its proper divisors (8545).

263903 is an equidigital number, since it uses as much as digits as its factorization.

263903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8544.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 263903 is about 513.7149014775. The cubic root of 263903 is about 64.1428287983.

The spelling of 263903 in words is "two hundred sixty-three thousand, nine hundred three".