263408 has 20 divisors (see below), whose sum is σ = 518568. Its totient is φ = 129600.

The previous prime is 263401. The next prime is 263411. The reversal of 263408 is 804362.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 263408.

It is not an unprimeable number, because it can be changed into a prime (263401) by changing a digit.

263408 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535 + ... + 1697.

2²⁶³⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

263408 is a deficient number, since it is larger than the sum of its proper divisors (255160).

263408 is a wasteful number, since it uses less digits than its factorization.

263408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 263408 is about 513.2328906062. The cubic root of 263408 is about 64.1026996948.

The spelling of 263408 in words is "two hundred sixty-three thousand, four hundred eight".