263749 has 4 divisors (see below), whose sum is σ = 267436. Its totient is φ = 260064.

The previous prime is 263737. The next prime is 263759. The reversal of 263749 is 947362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47524 + 216225 = 218^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 263749 - 2⁷ = 263621 is a prime.

It is a d-powerful number, because it can be written as 2³ + 6⁴ + 7² + 3⁵ + 4⁹ + 9 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 263749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263729) 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, 1734 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (66859).

2²⁶³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

263749 is a deficient number, since it is larger than the sum of its proper divisors (3687).

263749 is an equidigital number, since it uses as much as digits as its factorization.

263749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686.

The product of its digits is 9072, while the sum is 31.

The square root of 263749 is about 513.5649910187. The cubic root of 263749 is about 64.1303495696.

The spelling of 263749 in words is "two hundred sixty-three thousand, seven hundred forty-nine".