2091908 has 36 divisors (see below), whose sum is σ = 4591692. Its totient is φ = 826560.

The previous prime is 2091889. The next prime is 2091913. The reversal of 2091908 is 8091902.

It can be written as a sum of positive squares in 2 ways, for example, as 432964 + 1658944 = 658^2 + 1288^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2138 + ... + 2958.

It is an arithmetic number, because the mean of its divisors is an integer number (127547).

2^2091908 is an apocalyptic number.

2091908 is a gapful number since it is divisible by the number (28) 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 2091908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2295846).

2091908 is an abundant number, since it is smaller than the sum of its proper divisors (2499784).

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

2091908 is a wasteful number, since it uses less digits than its factorization.

2091908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 2091908 is about 1446.3429745396. The cubic root of 2091908 is about 127.8932214963.

The spelling of 2091908 in words is "two million, ninety-one thousand, nine hundred eight".