2191740 has 24 divisors (see below), whose sum is σ = 6137040. Its totient is φ = 584448.

The previous prime is 2191727. The next prime is 2191799. The reversal of 2191740 is 471912.

2191740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2191740.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 18205 + ... + 18324.

It is an arithmetic number, because the mean of its divisors is an integer number (255710).

2^2191740 is an apocalyptic number.

2191740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191740 is an abundant number, since it is smaller than the sum of its proper divisors (3945300).

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

2191740 is a wasteful number, since it uses less digits than its factorization.

2191740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36541 (or 36539 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 2191740 is about 1480.4526334875. The cubic root of 2191740 is about 129.8961695586.

The spelling of 2191740 in words is "two million, one hundred ninety-one thousand, seven hundred forty".