381228 has 12 divisors (see below), whose sum is σ = 889560. Its totient is φ = 127072.

The previous prime is 381223. The next prime is 381233. The reversal of 381228 is 822183.

381228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (381223) and next prime (381233).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 381198 and 381207.

It is not an unprimeable number, because it can be changed into a prime (381221) 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, 15873 + ... + 15896.

It is an arithmetic number, because the mean of its divisors is an integer number (74130).

2³⁸¹²²⁸ is an apocalyptic number.

It is an amenable number.

381228 is an abundant number, since it is smaller than the sum of its proper divisors (508332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381228 is a wasteful number, since it uses less digits than its factorization.

381228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31776 (or 31774 counting only the distinct ones).

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

The square root of 381228 is about 617.4366364251. The cubic root of 381228 is about 72.5095033123.

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

The spelling of 381228 in words is "three hundred eighty-one thousand, two hundred twenty-eight".