1247307305 has 8 divisors (see below), whose sum is σ = 1499296392. Its totient is φ = 996160768.

The previous prime is 1247307287. The next prime is 1247307311. The reversal of 1247307305 is 5037037421.

It can be written as a sum of positive squares in 4 ways, for example, as 230462761 + 1016844544 = 15181^2 + 31888^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1247307305 - 2⁶ = 1247307241 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 207374 + ... + 213303.

It is an arithmetic number, because the mean of its divisors is an integer number (187412049).

Almost surely, 2^1247307305 is an apocalyptic number.

It is an amenable number.

1247307305 is a deficient number, since it is larger than the sum of its proper divisors (251989087).

1247307305 is an equidigital number, since it uses as much as digits as its factorization.

1247307305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421275.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 1247307305 is about 35317.2380715140. The cubic root of 1247307305 is about 1076.4432908694.

The spelling of 1247307305 in words is "one billion, two hundred forty-seven million, three hundred seven thousand, three hundred five".