1288985812 has 12 divisors (see below), whose sum is σ = 2258867520. Its totient is φ = 643595096.

The previous prime is 1288985809. The next prime is 1288985833. The reversal of 1288985812 is 2185898821.

It is a super-2 number, since 2×1288985812² = 3322968847074598688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1288985812.

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, 221218 + ... + 226969.

It is an arithmetic number, because the mean of its divisors is an integer number (188238960).

Almost surely, 2^1288985812 is an apocalyptic number.

It is an amenable number.

1288985812 is a deficient number, since it is larger than the sum of its proper divisors (969881708).

1288985812 is a wasteful number, since it uses less digits than its factorization.

1288985812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448910 (or 448908 counting only the distinct ones).

The product of its digits is 737280, while the sum is 52.

The square root of 1288985812 is about 35902.4485515960. The cubic root of 1288985812 is about 1088.3018790440.

The spelling of 1288985812 in words is "one billion, two hundred eighty-eight million, nine hundred eighty-five thousand, eight hundred twelve".