381309228 has 36 divisors (see below), whose sum is σ = 989105880. Its totient is φ = 127035432.

The previous prime is 381309199. The next prime is 381309259. The reversal of 381309228 is 822903183.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 381309192 and 381309201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201993 + ... + 203871.

Almost surely, 2^381309228 is an apocalyptic number.

It is an amenable number.

381309228 is an abundant number, since it is smaller than the sum of its proper divisors (607796652).

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

381309228 is an equidigital number, since it uses as much as digits as its factorization.

381309228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3771 (or 1884 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 381309228 is about 19527.1408045315. The cubic root of 381309228 is about 725.1465279738.

The spelling of 381309228 in words is "three hundred eighty-one million, three hundred nine thousand, two hundred twenty-eight".