990432 has 72 divisors (see below), whose sum is σ = 2981160. Its totient is φ = 311040.

The previous prime is 990397. The next prime is 990463. The reversal of 990432 is 234099.

990432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 990396 and 990405.

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, 5382 + ... + 5562.

It is an arithmetic number, because the mean of its divisors is an integer number (41405).

2⁹⁹⁰⁴³² 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 990432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1490580).

990432 is an abundant number, since it is smaller than the sum of its proper divisors (1990728).

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

990432 is a wasteful number, since it uses less digits than its factorization.

990432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 990432 is about 995.2045015975. The cubic root of 990432 is about 99.6800440403.

The spelling of 990432 in words is "nine hundred ninety thousand, four hundred thirty-two".