381888305 has 4 divisors (see below), whose sum is σ = 458265972. Its totient is φ = 305510640.

The previous prime is 381888293. The next prime is 381888313. The reversal of 381888305 is 503888183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503888183 = 5839 ⋅86297.

It can be written as a sum of positive squares in 2 ways, for example, as 118897216 + 262991089 = 10904^2 + 16217^2 .

It is not a de Polignac number, because 381888305 - 2¹⁶ = 381822769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38188826 + ... + 38188835.

It is an arithmetic number, because the mean of its divisors is an integer number (114566493).

Almost surely, 2^381888305 is an apocalyptic number.

It is an amenable number.

381888305 is a deficient number, since it is larger than the sum of its proper divisors (76377667).

381888305 is an equidigital number, since it uses as much as digits as its factorization.

381888305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76377666.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 381888305 is about 19541.9626701107. The cubic root of 381888305 is about 725.5134246684.

The spelling of 381888305 in words is "three hundred eighty-one million, eight hundred eighty-eight thousand, three hundred five".