263643 has 4 divisors (see below), whose sum is σ = 351528. Its totient is φ = 175760.

The previous prime is 263621. The next prime is 263647. The reversal of 263643 is 346362.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 263643 - 2⁵ = 263611 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (263647) 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, 43938 + ... + 43943.

It is an arithmetic number, because the mean of its divisors is an integer number (87882).

2²⁶³⁶⁴³ is an apocalyptic number.

263643 is a deficient number, since it is larger than the sum of its proper divisors (87885).

263643 is an equidigital number, since it uses as much as digits as its factorization.

263643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87884.

The product of its digits is 2592, while the sum is 24.

The square root of 263643 is about 513.4617804667. The cubic root of 263643 is about 64.1217571479.

The spelling of 263643 in words is "two hundred sixty-three thousand, six hundred forty-three".