1286889 has 16 divisors (see below), whose sum is σ = 1831680. Its totient is φ = 801360.

The previous prime is 1286881. The next prime is 1286939. The reversal of 1286889 is 9886821.

It is not a de Polignac number, because 1286889 - 2³ = 1286881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1286889.

It is not an unprimeable number, because it can be changed into a prime (1286881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5994 + ... + 6204.

It is an arithmetic number, because the mean of its divisors is an integer number (114480).

2^1286889 is an apocalyptic number.

1286889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1286889 is a deficient number, since it is larger than the sum of its proper divisors (544791).

1286889 is a wasteful number, since it uses less digits than its factorization.

1286889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its digits is 55296, while the sum is 42.

The square root of 1286889 is about 1134.4113010721. The cubic root of 1286889 is about 108.7711439929.

The spelling of 1286889 in words is "one million, two hundred eighty-six thousand, eight hundred eighty-nine".