263921 has 8 divisors (see below), whose sum is σ = 310080. Its totient is φ = 219888.

The previous prime is 263911. The next prime is 263927. The reversal of 263921 is 129362.

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

It is a cyclic number.

It is not a de Polignac number, because 263921 - 2¹⁰ = 262897 is a prime.

It is a Duffinian number.

It is a Curzon 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 263921.

It is not an unprimeable number, because it can be changed into a prime (263927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251 + ... + 768.

It is an arithmetic number, because the mean of its divisors is an integer number (38760).

2²⁶³⁹²¹ is an apocalyptic number.

It is an amenable number.

263921 is a deficient number, since it is larger than the sum of its proper divisors (46159).

263921 is a wasteful number, since it uses less digits than its factorization.

263921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063.

The product of its digits is 648, while the sum is 23.

The square root of 263921 is about 513.7324206238. The cubic root of 263921 is about 64.1442870925.

The spelling of 263921 in words is "two hundred sixty-three thousand, nine hundred twenty-one".