381500556 has 12 divisors (see below), whose sum is σ = 890167992. Its totient is φ = 127166848.

The previous prime is 381500503. The next prime is 381500569. The reversal of 381500556 is 655005183.

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

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, 15895845 + ... + 15895868.

It is an arithmetic number, because the mean of its divisors is an integer number (74180666).

Almost surely, 2^381500556 is an apocalyptic number.

It is an amenable number.

381500556 is an abundant number, since it is smaller than the sum of its proper divisors (508667436).

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

381500556 is a wasteful number, since it uses less digits than its factorization.

381500556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31791720 (or 31791718 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 381500556 is about 19532.0392176547. The cubic root of 381500556 is about 725.2677923143.

The spelling of 381500556 in words is "three hundred eighty-one million, five hundred thousand, five hundred fifty-six".