381938481 has 12 divisors (see below), whose sum is σ = 552246708. Its totient is φ = 254368224.

The previous prime is 381938471. The next prime is 381938489. The reversal of 381938481 is 184839183.

381938481 is a `hidden beast` number, since 3 + 81 + 93 + 8 + 481 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 138297600 + 243640881 = 11760^2 + 15609^2 .

It is not a de Polignac number, because 381938481 - 2⁵ = 381938449 is a prime.

It is a super-2 number, since 2×381938481² = 291754006537174722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381938489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11830 + ... + 30063.

It is an arithmetic number, because the mean of its divisors is an integer number (46020559).

Almost surely, 2^381938481 is an apocalyptic number.

It is an amenable number.

381938481 is a deficient number, since it is larger than the sum of its proper divisors (170308227).

381938481 is a wasteful number, since it uses less digits than its factorization.

381938481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42912 (or 42909 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 381938481 is about 19543.2464293935. The cubic root of 381938481 is about 725.5451981538.

The spelling of 381938481 in words is "three hundred eighty-one million, nine hundred thirty-eight thousand, four hundred eighty-one".