1289885 has 8 divisors (see below), whose sum is σ = 1562976. Its totient is φ = 1021840.

The previous prime is 1289881. The next prime is 1289921. The reversal of 1289885 is 5889821.

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

It is not a de Polignac number, because 1289885 - 2² = 1289881 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 (1289881) 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, 671 + ... + 1740.

It is an arithmetic number, because the mean of its divisors is an integer number (195372).

2^1289885 is an apocalyptic number.

It is an amenable number.

1289885 is a deficient number, since it is larger than the sum of its proper divisors (273091).

1289885 is a wasteful number, since it uses less digits than its factorization.

1289885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523.

The product of its digits is 46080, while the sum is 41.

The square root of 1289885 is about 1135.7310421046. The cubic root of 1289885 is about 108.8554884292.

The spelling of 1289885 in words is "one million, two hundred eighty-nine thousand, eight hundred eighty-five".