305242805 has 24 divisors (see below), whose sum is σ = 427474008. Its totient is φ = 208631808.

The previous prime is 305242799. The next prime is 305242811. The reversal of 305242805 is 508242503.

It is an interprime number because it is at equal distance from previous prime (305242799) and next prime (305242811).

It can be written as a sum of positive squares in 4 ways, for example, as 461041 + 304781764 = 679^2 + 17458^2 .

It is not a de Polignac number, because 305242805 - 2⁴ = 305242789 is a prime.

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 (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80717 + ... + 84413.

It is an arithmetic number, because the mean of its divisors is an integer number (17811417).

Almost surely, 2^305242805 is an apocalyptic number.

305242805 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

305242805 is a deficient number, since it is larger than the sum of its proper divisors (122231203).

305242805 is a wasteful number, since it uses less digits than its factorization.

305242805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053 (or 4046 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 305242805 is about 17471.1993005632. The cubic root of 305242805 is about 673.3101249775.

The spelling of 305242805 in words is "three hundred five million, two hundred forty-two thousand, eight hundred five".