305768381 has 4 divisors (see below), whose sum is σ = 305816700. Its totient is φ = 305720064.

The previous prime is 305768363. The next prime is 305768383. The reversal of 305768381 is 183867503.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 255840025 + 49928356 = 15995^2 + 7066^2 .

It is a cyclic number.

It is not a de Polignac number, because 305768381 - 2⁶ = 305768317 is a prime.

It is a super-2 number, since 2×305768381² = 186988605638722322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305768383) 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, 12926 + ... + 27903.

It is an arithmetic number, because the mean of its divisors is an integer number (76454175).

Almost surely, 2^305768381 is an apocalyptic number.

It is an amenable number.

305768381 is a deficient number, since it is larger than the sum of its proper divisors (48319).

305768381 is an equidigital number, since it uses as much as digits as its factorization.

305768381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48318.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 305768381 is about 17486.2340428121. The cubic root of 305768381 is about 673.6963450904.

The spelling of 305768381 in words is "three hundred five million, seven hundred sixty-eight thousand, three hundred eighty-one".