1247663045 has 16 divisors (see below), whose sum is σ = 1552857600. Its totient is φ = 961329600.

The previous prime is 1247663033. The next prime is 1247663057. The reversal of 1247663045 is 5403667421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1247663033) and next prime (1247663057).

It is not a de Polignac number, because 1247663045 - 2⁶ = 1247662981 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13631 + ... + 51779.

It is an arithmetic number, because the mean of its divisors is an integer number (97053600).

Almost surely, 2^1247663045 is an apocalyptic number.

It is an amenable number.

1247663045 is a deficient number, since it is larger than the sum of its proper divisors (305194555).

1247663045 is a wasteful number, since it uses less digits than its factorization.

1247663045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38396.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 1247663045 is about 35322.2740632593. The cubic root of 1247663045 is about 1076.5456173064.

The spelling of 1247663045 in words is "one billion, two hundred forty-seven million, six hundred sixty-three thousand, forty-five".