1247650945 has 8 divisors (see below), whose sum is σ = 1501133760. Its totient is φ = 995485680.

The previous prime is 1247650931. The next prime is 1247650969. The reversal of 1247650945 is 5490567421.

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

It is not a de Polignac number, because 1247650945 - 2⁵ = 1247650913 is a prime.

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, 327301 + ... + 331090.

It is an arithmetic number, because the mean of its divisors is an integer number (187641720).

Almost surely, 2^1247650945 is an apocalyptic number.

It is an amenable number.

1247650945 is a deficient number, since it is larger than the sum of its proper divisors (253482815).

1247650945 is an equidigital number, since it uses as much as digits as its factorization.

1247650945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658775.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 1247650945 is about 35322.1027828186. The cubic root of 1247650945 is about 1076.5421371349.

The spelling of 1247650945 in words is "one billion, two hundred forty-seven million, six hundred fifty thousand, nine hundred forty-five".