381856731 has 8 divisors (see below), whose sum is σ = 510801984. Its totient is φ = 253741320.

The previous prime is 381856721. The next prime is 381856751. The reversal of 381856731 is 137658183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381856731 - 2⁹ = 381856219 is a prime.

It is a super-2 number, since 2×381856731² = 291629126020012722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381856721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206385 + ... + 208226.

It is an arithmetic number, because the mean of its divisors is an integer number (63850248).

Almost surely, 2^381856731 is an apocalyptic number.

381856731 is a deficient number, since it is larger than the sum of its proper divisors (128945253).

381856731 is a wasteful number, since it uses less digits than its factorization.

381856731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414921.

The product of its digits is 120960, while the sum is 42.

The square root of 381856731 is about 19541.1548021093. The cubic root of 381856731 is about 725.4934292999.

The spelling of 381856731 in words is "three hundred eighty-one million, eight hundred fifty-six thousand, seven hundred thirty-one".