381555018 has 36 divisors (see below), whose sum is σ = 895193910. Its totient is φ = 117400608.

The previous prime is 381554969. The next prime is 381555023. The reversal of 381555018 is 810555183.

It can be written as a sum of positive squares in 3 ways, for example, as 132641289 + 248913729 = 11517^2 + 15777^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 59673 + ... + 65756.

Almost surely, 2^381555018 is an apocalyptic number.

381555018 is an abundant number, since it is smaller than the sum of its proper divisors (513638892).

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

381555018 is a wasteful number, since it uses less digits than its factorization.

381555018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125463 (or 125447 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The square root of 381555018 is about 19533.4333387656. The cubic root of 381555018 is about 725.3023031028.

The spelling of 381555018 in words is "three hundred eighty-one million, five hundred fifty-five thousand, eighteen".