263906 has 8 divisors (see below), whose sum is σ = 399360. Its totient is φ = 130788.

The previous prime is 263899. The next prime is 263909. The reversal of 263906 is 609362.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263909) by changing a digit.

263906 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266 + ... + 773.

It is an arithmetic number, because the mean of its divisors is an integer number (49920).

2²⁶³⁹⁰⁶ is an apocalyptic number.

263906 is a deficient number, since it is larger than the sum of its proper divisors (135454).

263906 is a wasteful number, since it uses less digits than its factorization.

263906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 263906 is about 513.7178213767. The cubic root of 263906 is about 64.1430718520.

The spelling of 263906 in words is "two hundred sixty-three thousand, nine hundred six".