381381606 has 24 divisors (see below), whose sum is σ = 831805104. Its totient is φ = 126284400.

The previous prime is 381381601. The next prime is 381381613. The reversal of 381381606 is 606183183.

381381606 is a `hidden beast` number, since 38 + 13 + 8 + 1 + 606 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381381601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67441 + ... + 72876.

It is an arithmetic number, because the mean of its divisors is an integer number (34658546).

Almost surely, 2^381381606 is an apocalyptic number.

381381606 is an abundant number, since it is smaller than the sum of its proper divisors (450423498).

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

381381606 is a wasteful number, since it uses less digits than its factorization.

381381606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140476 (or 140473 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 381381606 is about 19528.9939833060. The cubic root of 381381606 is about 725.1924061667.

The spelling of 381381606 in words is "three hundred eighty-one million, three hundred eighty-one thousand, six hundred six".