381820228 has 12 divisors (see below), whose sum is σ = 679139692. Its totient is φ = 187780320.

The previous prime is 381820223. The next prime is 381820237. The reversal of 381820228 is 822028183.

It can be written as a sum of positive squares in 2 ways, for example, as 191600964 + 190219264 = 13842^2 + 13792^2 .

It is a junction number, because it is equal to n+sod(n) for n = 381820193 and 381820202.

It is not an unprimeable number, because it can be changed into a prime (381820223) 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, 782175 + ... + 782662.

Almost surely, 2^381820228 is an apocalyptic number.

It is an amenable number.

381820228 is a deficient number, since it is larger than the sum of its proper divisors (297319464).

381820228 is a wasteful number, since it uses less digits than its factorization.

381820228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564902 (or 1564900 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 381820228 is about 19540.2207766443. The cubic root of 381820228 is about 725.4703110914.

The spelling of 381820228 in words is "three hundred eighty-one million, eight hundred twenty thousand, two hundred twenty-eight".