1289247916 has 24 divisors (see below), whose sum is σ = 2467200960. Its totient is φ = 584614800.

The previous prime is 1289247901. The next prime is 1289247919. The reversal of 1289247916 is 6197429821.

It is a self number, because there is not a number n which added to its sum of digits gives 1289247916.

It is not an unprimeable number, because it can be changed into a prime (1289247919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16530 + ... + 53401.

It is an arithmetic number, because the mean of its divisors is an integer number (102800040).

Almost surely, 2^1289247916 is an apocalyptic number.

It is an amenable number.

1289247916 is a deficient number, since it is larger than the sum of its proper divisors (1177953044).

1289247916 is a wasteful number, since it uses less digits than its factorization.

1289247916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70365 (or 70363 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 1289247916 is about 35906.0985906294. The cubic root of 1289247916 is about 1088.3756396034.

The spelling of 1289247916 in words is "one billion, two hundred eighty-nine million, two hundred forty-seven thousand, nine hundred sixteen".