989904 has 40 divisors (see below), whose sum is σ = 2624832. Its totient is φ = 321280.

The previous prime is 989887. The next prime is 989909. The reversal of 989904 is 409989.

989904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1717 + ... + 2219.

2⁹⁸⁹⁹⁰⁴ 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 989904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1312416).

989904 is an abundant number, since it is smaller than the sum of its proper divisors (1634928).

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

989904 is a wasteful number, since it uses less digits than its factorization.

989904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 989904 is about 994.9391941219. The cubic root of 989904 is about 99.6623277244.

The spelling of 989904 in words is "nine hundred eighty-nine thousand, nine hundred four".