263506 has 8 divisors (see below), whose sum is σ = 397440. Its totient is φ = 131028.

The previous prime is 263503. The next prime is 263513. The reversal of 263506 is 605362.

263506 is nontrivially palindromic in base 13.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 2¹³ + 6 + 5⁷ + 3¹¹ + 0 + 6² .

It is not an unprimeable number, because it can be changed into a prime (263503) 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, 535 + ... + 901.

It is an arithmetic number, because the mean of its divisors is an integer number (49680).

2²⁶³⁵⁰⁶ is an apocalyptic number.

263506 is a deficient number, since it is larger than the sum of its proper divisors (133934).

263506 is a wasteful number, since it uses less digits than its factorization.

263506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 263506 is about 513.3283549542. The cubic root of 263506 is about 64.1106484354.

Adding to 263506 its reverse (605362), we get a palindrome (868868).

The spelling of 263506 in words is "two hundred sixty-three thousand, five hundred six".