381309216 has 48 divisors (see below), whose sum is σ = 1002002400. Its totient is φ = 126967808.

The previous prime is 381309199. The next prime is 381309259. The reversal of 381309216 is 612903183.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133855 + ... + 136673.

It is an arithmetic number, because the mean of its divisors is an integer number (20875050).

Almost surely, 2^381309216 is an apocalyptic number.

It is an amenable number.

381309216 is an abundant number, since it is smaller than the sum of its proper divisors (620693184).

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

381309216 is a wasteful number, since it uses less digits than its factorization.

381309216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4241 (or 4233 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 381309216 is about 19527.1404972669. The cubic root of 381309216 is about 725.1465203669.

The spelling of 381309216 in words is "three hundred eighty-one million, three hundred nine thousand, two hundred sixteen".