It is a tau number, because it is divible by the number of its divisors (64).
It is an unprimeable number.
22129920 is an apocalyptic number.
2129920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2129920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2752470).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2129920 is an frugal number, since it uses more digits than its factorization.
2129920 is an evil number, because the sum of its binary digits is even.
The square root of 2129920 is about 1459.4245441269. The cubic root of 2129920 is about 128.6632242748.
The spelling of 2129920 in words is "two million, one hundred twenty-nine thousand, nine hundred twenty".