2191280 has 120 divisors (see below), whose sum is σ = 6530832. Its totient is φ = 677376.

The previous prime is 2191261. The next prime is 2191291. The reversal of 2191280 is 821912.

2191280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50939 + ... + 50981.

2^2191280 is an apocalyptic number.

2191280 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 2191280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3265416).

2191280 is an abundant number, since it is smaller than the sum of its proper divisors (4339552).

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

2191280 is a wasteful number, since it uses less digits than its factorization.

2191280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2191280 is about 1480.2972674433. The cubic root of 2191280 is about 129.8870814340.

The spelling of 2191280 in words is "two million, one hundred ninety-one thousand, two hundred eighty".