263987 has 4 divisors (see below), whose sum is σ = 273120. Its totient is φ = 254856.

The previous prime is 263983. The next prime is 264007. The reversal of 263987 is 789362.

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

It is a cyclic number.

It is not a de Polignac number, because 263987 - 2² = 263983 is a prime.

It is a d-powerful number, because it can be written as 2¹⁵ + 6⁶ + 9⁴ + 3¹¹ + 8³ + 7³ .

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 263987.

It is not an unprimeable number, because it can be changed into a prime (263983) 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, 4523 + ... + 4580.

It is an arithmetic number, because the mean of its divisors is an integer number (68280).

2²⁶³⁹⁸⁷ is an apocalyptic number.

263987 is a deficient number, since it is larger than the sum of its proper divisors (9133).

263987 is an equidigital number, since it uses as much as digits as its factorization.

263987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9132.

The product of its digits is 18144, while the sum is 35.

The square root of 263987 is about 513.7966523830. The cubic root of 263987 is about 64.1496336042.

The spelling of 263987 in words is "two hundred sixty-three thousand, nine hundred eighty-seven".