1288965894 has 12 divisors (see below), whose sum is σ = 2578107684. Its totient is φ = 429625984.

The previous prime is 1288965889. The next prime is 1288965919. The reversal of 1288965894 is 4985698821.

It is a super-3 number, since 3×1288965894³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 80614 + ... + 95270.

It is an arithmetic number, because the mean of its divisors is an integer number (214842307).

Almost surely, 2^1288965894 is an apocalyptic number.

1288965894 is an abundant number, since it is smaller than the sum of its proper divisors (1289141790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1288965894 is an frugal number, since it uses more digits than its factorization.

1288965894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29319 (or 14662 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 60.

The square root of 1288965894 is about 35902.1711599730. The cubic root of 1288965894 is about 1088.2962733685.

The spelling of 1288965894 in words is "one billion, two hundred eighty-eight million, nine hundred sixty-five thousand, eight hundred ninety-four".