381845605 has 4 divisors (see below), whose sum is σ = 458214732. Its totient is φ = 305476480.

The previous prime is 381845599. The next prime is 381845621. The reversal of 381845605 is 506548183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506548183 = 461 ⋅1098803.

It can be written as a sum of positive squares in 2 ways, for example, as 65788321 + 316057284 = 8111^2 + 17778^2 .

It is not a de Polignac number, because 381845605 - 2²⁵ = 348291173 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38184556 + ... + 38184565.

It is an arithmetic number, because the mean of its divisors is an integer number (114553683).

Almost surely, 2^381845605 is an apocalyptic number.

It is an amenable number.

381845605 is a deficient number, since it is larger than the sum of its proper divisors (76369127).

381845605 is an equidigital number, since it uses as much as digits as its factorization.

381845605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76369126.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 381845605 is about 19540.8701188048. The cubic root of 381845605 is about 725.4863830985.

The spelling of 381845605 in words is "three hundred eighty-one million, eight hundred forty-five thousand, six hundred five".