263947 has 4 divisors (see below), whose sum is σ = 268336. Its totient is φ = 259560.

The previous prime is 263941. The next prime is 263951. The reversal of 263947 is 749362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749362 = 2 ⋅374681.

It is a cyclic number.

It is not a de Polignac number, because 263947 - 2⁷ = 263819 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 6⁴ + 9 + 3³ + 4⁹ + 7³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263941) 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, 2103 + ... + 2224.

It is an arithmetic number, because the mean of its divisors is an integer number (67084).

2²⁶³⁹⁴⁷ is an apocalyptic number.

263947 is a deficient number, since it is larger than the sum of its proper divisors (4389).

263947 is an equidigital number, since it uses as much as digits as its factorization.

263947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388.

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

The square root of 263947 is about 513.7577250027. The cubic root of 263947 is about 64.1463934005.

The spelling of 263947 in words is "two hundred sixty-three thousand, nine hundred forty-seven".