1289284885 has 32 divisors (see below), whose sum is σ = 1833523200. Its totient is φ = 851662080.

The previous prime is 1289284861. The next prime is 1289284907. The reversal of 1289284885 is 5884829821.

It is not a de Polignac number, because 1289284885 - 2¹⁷ = 1289153813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245871 + ... + 251059.

It is an arithmetic number, because the mean of its divisors is an integer number (57297600).

Almost surely, 2^1289284885 is an apocalyptic number.

It is an amenable number.

1289284885 is a deficient number, since it is larger than the sum of its proper divisors (544238315).

1289284885 is a wasteful number, since it uses less digits than its factorization.

1289284885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461.

The product of its digits is 2949120, while the sum is 55.

The square root of 1289284885 is about 35906.6133880654. The cubic root of 1289284885 is about 1088.3860425093.

The spelling of 1289284885 in words is "one billion, two hundred eighty-nine million, two hundred eighty-four thousand, eight hundred eighty-five".