1242307305 has 24 divisors (see below), whose sum is σ = 2266667520. Its totient is φ = 627691680.

The previous prime is 1242307289. The next prime is 1242307309. The reversal of 1242307305 is 5037032421.

1242307305 is a `hidden beast` number, since 12 + 42 + 307 + 305 = 666.

It is not a de Polignac number, because 1242307305 - 2⁴ = 1242307289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1242307309) by changing a digit.

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, 725641 + ... + 727350.

It is an arithmetic number, because the mean of its divisors is an integer number (94444480).

Almost surely, 2^1242307305 is an apocalyptic number.

1242307305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242307305 is a deficient number, since it is larger than the sum of its proper divisors (1024360215).

1242307305 is a wasteful number, since it uses less digits than its factorization.

1242307305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453021 (or 1453018 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 1242307305 is about 35246.3800268907. The cubic root of 1242307305 is about 1075.0030084646.

Adding to 1242307305 its reverse (5037032421), we get a palindrome (6279339726).

The spelling of 1242307305 in words is "one billion, two hundred forty-two million, three hundred seven thousand, three hundred five".