381985727 has 4 divisors (see below), whose sum is σ = 390869160. Its totient is φ = 373102296.

The previous prime is 381985691. The next prime is 381985739. The reversal of 381985727 is 727589183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 727589183 = 5107 ⋅142469.

It is a cyclic number.

It is not a de Polignac number, because 381985727 - 2¹⁶ = 381920191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381981727) 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 3 ways as a sum of consecutive naturals, for example, 4441652 + ... + 4441737.

It is an arithmetic number, because the mean of its divisors is an integer number (97717290).

Almost surely, 2^381985727 is an apocalyptic number.

381985727 is a deficient number, since it is larger than the sum of its proper divisors (8883433).

381985727 is an equidigital number, since it uses as much as digits as its factorization.

381985727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8883432.

The product of its digits is 846720, while the sum is 50.

The square root of 381985727 is about 19544.4551471767. The cubic root of 381985727 is about 725.5751137002.

The spelling of 381985727 in words is "three hundred eighty-one million, nine hundred eighty-five thousand, seven hundred twenty-seven".