2091280 has 20 divisors (see below), whose sum is σ = 4862412. Its totient is φ = 836480.

The previous prime is 2091269. The next prime is 2091281. The reversal of 2091280 is 821902.

It can be written as a sum of positive squares in 2 ways, for example, as 1115136 + 976144 = 1056^2 + 988^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (2091281) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12991 + ... + 13150.

2^2091280 is an apocalyptic number.

2091280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2091280 is an abundant number, since it is smaller than the sum of its proper divisors (2771132).

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

2091280 is a wasteful number, since it uses less digits than its factorization.

2091280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26154 (or 26148 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2091280 is about 1446.1258589763. The cubic root of 2091280 is about 127.8804221791.

The spelling of 2091280 in words is "two million, ninety-one thousand, two hundred eighty".