228381 has 8 divisors (see below), whose sum is σ = 306720. Its totient is φ = 151152.

The previous prime is 228359. The next prime is 228383. The reversal of 228381 is 183822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228381 - 2⁹ = 227869 is a prime.

It is a super-2 number, since 2×228381² = 104315762322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 228381.

It is not an unprimeable number, because it can be changed into a prime (228383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666 + ... + 948.

It is an arithmetic number, because the mean of its divisors is an integer number (38340).

2²²⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

228381 is a deficient number, since it is larger than the sum of its proper divisors (78339).

228381 is a wasteful number, since it uses less digits than its factorization.

228381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555.

The product of its digits is 768, while the sum is 24.

The square root of 228381 is about 477.8922472692. The cubic root of 228381 is about 61.1251573467.

It can be divided in two parts, 228 and 381, that multiplied together give a palindrome (86868).

The spelling of 228381 in words is "two hundred twenty-eight thousand, three hundred eighty-one".