306240505 has 4 divisors (see below), whose sum is σ = 367488612. Its totient is φ = 244992400.

The previous prime is 306240481. The next prime is 306240511. The reversal of 306240505 is 505042603.

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 219899241 + 86341264 = 14829^2 + 9292^2 .

It is not a de Polignac number, because 306240505 - 2⁹ = 306239993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 306240505.

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, 30624046 + ... + 30624055.

It is an arithmetic number, because the mean of its divisors is an integer number (91872153).

Almost surely, 2^306240505 is an apocalyptic number.

It is an amenable number.

306240505 is a deficient number, since it is larger than the sum of its proper divisors (61248107).

306240505 is an equidigital number, since it uses as much as digits as its factorization.

306240505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61248106.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 306240505 is about 17499.7287121829. The cubic root of 306240505 is about 674.0429087729.

The spelling of 306240505 in words is "three hundred six million, two hundred forty thousand, five hundred five".