1268286989 has 8 divisors (see below), whose sum is σ = 1375646328. Its totient is φ = 1164567040.

The previous prime is 1268286983. The next prime is 1268287001. The reversal of 1268286989 is 9896828621.

It can be written as a sum of positive squares in 4 ways, for example, as 386790889 + 881496100 = 19667^2 + 29690^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1268286989 - 2²⁸ = 999851533 is a prime.

It is a super-2 number, since 2×1268286989² = 3217103772933372242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268286983) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 909122 + ... + 910515.

It is an arithmetic number, because the mean of its divisors is an integer number (171955791).

Almost surely, 2^1268286989 is an apocalyptic number.

It is an amenable number.

1268286989 is a deficient number, since it is larger than the sum of its proper divisors (107359339).

1268286989 is a wasteful number, since it uses less digits than its factorization.

1268286989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819695.

The product of its digits is 5971968, while the sum is 59.

The square root of 1268286989 is about 35613.0171285725. The cubic root of 1268286989 is about 1082.4450175197.

The spelling of 1268286989 in words is "one billion, two hundred sixty-eight million, two hundred eighty-six thousand, nine hundred eighty-nine".