381691056 has 20 divisors (see below), whose sum is σ = 986035352. Its totient is φ = 127230336.

The previous prime is 381691043. The next prime is 381691067. The reversal of 381691056 is 650196183.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3975901 + ... + 3975996.

Almost surely, 2^381691056 is an apocalyptic number.

It is an amenable number.

381691056 is an abundant number, since it is smaller than the sum of its proper divisors (604344296).

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

381691056 is a wasteful number, since it uses less digits than its factorization.

381691056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7951908 (or 7951902 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 381691056 is about 19536.9152119776. The cubic root of 381691056 is about 725.3884915912.

The spelling of 381691056 in words is "three hundred eighty-one million, six hundred ninety-one thousand, fifty-six".