263973 has 4 divisors (see below), whose sum is σ = 351968. Its totient is φ = 175980.

The previous prime is 263957. The next prime is 263983. The reversal of 263973 is 379362.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 263973 - 2⁴ = 263957 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 263973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263933) by changing a digit.

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, 43993 + ... + 43998.

It is an arithmetic number, because the mean of its divisors is an integer number (87992).

2²⁶³⁹⁷³ is an apocalyptic number.

It is an amenable number.

263973 is a deficient number, since it is larger than the sum of its proper divisors (87995).

263973 is an equidigital number, since it uses as much as digits as its factorization.

263973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87994.

The product of its digits is 6804, while the sum is 30.

The square root of 263973 is about 513.7830281354. The cubic root of 263973 is about 64.1484995701.

The spelling of 263973 in words is "two hundred sixty-three thousand, nine hundred seventy-three".