889640 has 32 divisors (see below), whose sum is σ = 2090880. Its totient is φ = 340032.

The previous prime is 889639. The next prime is 889657. The reversal of 889640 is 46988.

It is a self number, because there is not a number n which added to its sum of digits gives 889640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437 + ... + 1403.

It is an arithmetic number, because the mean of its divisors is an integer number (65340).

2⁸⁸⁹⁶⁴⁰ 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 889640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045440).

889640 is an abundant number, since it is smaller than the sum of its proper divisors (1201240).

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

889640 is a wasteful number, since it uses less digits than its factorization.

889640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 889640 is about 943.2072942890. The cubic root of 889640 is about 96.1770459712.

The spelling of 889640 in words is "eight hundred eighty-nine thousand, six hundred forty".