1289688 has 64 divisors (see below), whose sum is σ = 3564000. Its totient is φ = 387072.

The previous prime is 1289677. The next prime is 1289711. The reversal of 1289688 is 8869821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11778 + ... + 11886.

2^1289688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1782000).

1289688 is an abundant number, since it is smaller than the sum of its proper divisors (2274312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289688 is a wasteful number, since it uses less digits than its factorization.

1289688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 160 counting only the distinct ones).

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

The square root of 1289688 is about 1135.6443105128. The cubic root of 1289688 is about 108.8499464305.

The spelling of 1289688 in words is "one million, two hundred eighty-nine thousand, six hundred eighty-eight".