1289844 has 36 divisors (see below), whose sum is σ = 3383744. Its totient is φ = 429624.

The previous prime is 1289839. The next prime is 1289851. The reversal of 1289844 is 4489821.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1289799 and 1289808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309 + ... + 1635.

2^1289844 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 1289844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1691872).

1289844 is an abundant number, since it is smaller than the sum of its proper divisors (2093900).

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

1289844 is a wasteful number, since it uses less digits than its factorization.

1289844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346 (or 1332 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 1289844 is about 1135.7129919130. The cubic root of 1289844 is about 108.8543350648.

The spelling of 1289844 in words is "one million, two hundred eighty-nine thousand, eight hundred forty-four".