1289723612 has 12 divisors (see below), whose sum is σ = 2334844680. Its totient is φ = 622625136.

The previous prime is 1289723609. The next prime is 1289723623. The reversal of 1289723612 is 2163279821.

It is a self number, because there is not a number n which added to its sum of digits gives 1289723612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5559038 + ... + 5559269.

It is an arithmetic number, because the mean of its divisors is an integer number (194570390).

Almost surely, 2^1289723612 is an apocalyptic number.

It is an amenable number.

1289723612 is a deficient number, since it is larger than the sum of its proper divisors (1045121068).

1289723612 is a wasteful number, since it uses less digits than its factorization.

1289723612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11118340 (or 11118338 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 1289723612 is about 35912.7221468938. The cubic root of 1289723612 is about 1088.5094830812.

The spelling of 1289723612 in words is "one billion, two hundred eighty-nine million, seven hundred twenty-three thousand, six hundred twelve".