1289922887 has 4 divisors (see below), whose sum is σ = 1407188616. Its totient is φ = 1172657160.

The previous prime is 1289922883. The next prime is 1289922917. The reversal of 1289922887 is 7882299821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7882299821 = 11 ⋅716572711.

It is a cyclic number.

It is not a de Polignac number, because 1289922887 - 2² = 1289922883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289922883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58632848 + ... + 58632869.

It is an arithmetic number, because the mean of its divisors is an integer number (351797154).

Almost surely, 2^1289922887 is an apocalyptic number.

1289922887 is a deficient number, since it is larger than the sum of its proper divisors (117265729).

1289922887 is a wasteful number, since it uses less digits than its factorization.

1289922887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117265728.

The product of its digits is 2322432, while the sum is 56.

The square root of 1289922887 is about 35915.4964743633. The cubic root of 1289922887 is about 1088.5655420059.

The spelling of 1289922887 in words is "one billion, two hundred eighty-nine million, nine hundred twenty-two thousand, eight hundred eighty-seven".