1289984 has 18 divisors (see below), whose sum is σ = 2575440. Its totient is φ = 644864.

The previous prime is 1289971. The next prime is 1290013. The reversal of 1289984 is 4899821.

1289984 is nontrivially palindromic in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2264 + ... + 2775.

It is an arithmetic number, because the mean of its divisors is an integer number (143080).

2^1289984 is an apocalyptic number.

It is an amenable number.

1289984 is a deficient number, since it is larger than the sum of its proper divisors (1285456).

1289984 is an frugal number, since it uses more digits than its factorization.

1289984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055 (or 5041 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 1289984 is about 1135.7746255310. The cubic root of 1289984 is about 108.8582732815.

The spelling of 1289984 in words is "one million, two hundred eighty-nine thousand, nine hundred eighty-four".