263963 has 6 divisors (see below), whose sum is σ = 307116. Its totient is φ = 226212.

The previous prime is 263957. The next prime is 263983. The reversal of 263963 is 369362.

It is not a de Polignac number, because 263963 - 2⁶ = 263899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2645 + ... + 2742.

It is an arithmetic number, because the mean of its divisors is an integer number (51186).

2²⁶³⁹⁶³ is an apocalyptic number.

263963 is a deficient number, since it is larger than the sum of its proper divisors (43153).

263963 is an equidigital number, since it uses as much as digits as its factorization.

263963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401 (or 5394 counting only the distinct ones).

The product of its digits is 5832, while the sum is 29.

The square root of 263963 is about 513.7732963088. The cubic root of 263963 is about 64.1476895213.

The spelling of 263963 in words is "two hundred sixty-three thousand, nine hundred sixty-three".