381006856 has 32 divisors (see below), whose sum is σ = 766792440. Its totient is φ = 176836608.

The previous prime is 381006853. The next prime is 381006859. The reversal of 381006856 is 658600183.

It is an interprime number because it is at equal distance from previous prime (381006853) and next prime (381006859).

It can be written as a sum of positive squares in 4 ways, for example, as 264582756 + 116424100 = 16266^2 + 10790^2 .

It is not an unprimeable number, because it can be changed into a prime (381006853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9261 + ... + 29116.

Almost surely, 2^381006856 is an apocalyptic number.

It is an amenable number.

381006856 is an abundant number, since it is smaller than the sum of its proper divisors (385785584).

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

381006856 is a wasteful number, since it uses less digits than its factorization.

381006856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38473 (or 38469 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 381006856 is about 19519.3969169132. The cubic root of 381006856 is about 724.9548008286.

The spelling of 381006856 in words is "three hundred eighty-one million, six thousand, eight hundred fifty-six".