381788556 has 48 divisors (see below), whose sum is σ = 914702208. Its totient is φ = 123868800.

The previous prime is 381788531. The next prime is 381788573. The reversal of 381788556 is 655887183.

It is a junction number, because it is equal to n+sod(n) for n = 381788499 and 381788508.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339411 + ... + 340533.

It is an arithmetic number, because the mean of its divisors is an integer number (19056296).

Almost surely, 2^381788556 is an apocalyptic number.

It is an amenable number.

381788556 is an abundant number, since it is smaller than the sum of its proper divisors (532913652).

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

381788556 is a wasteful number, since it uses less digits than its factorization.

381788556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862 (or 1860 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 51.

The square root of 381788556 is about 19539.4103288712. The cubic root of 381788556 is about 725.4502512750.

The spelling of 381788556 in words is "three hundred eighty-one million, seven hundred eighty-eight thousand, five hundred fifty-six".