268381 has 4 divisors (see below), whose sum is σ = 269500. Its totient is φ = 267264.

The previous prime is 268343. The next prime is 268403. The reversal of 268381 is 183862.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 152100 + 116281 = 390^2 + 341^2 .

It is a cyclic number.

It is not a de Polignac number, because 268381 - 2⁷ = 268253 is a prime.

It is a super-2 number, since 2×268381² = 144056722322, which contains 22 as substring.

It is a Duffinian number.

268381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268781) 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, 36 + ... + 733.

It is an arithmetic number, because the mean of its divisors is an integer number (67375).

2²⁶⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

268381 is a deficient number, since it is larger than the sum of its proper divisors (1119).

268381 is an equidigital number, since it uses as much as digits as its factorization.

268381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118.

The product of its digits is 2304, while the sum is 28.

The square root of 268381 is about 518.0550163834. The cubic root of 268381 is about 64.5035953367.

The spelling of 268381 in words is "two hundred sixty-eight thousand, three hundred eighty-one".