2011640 has 16 divisors (see below), whose sum is σ = 4526280. Its totient is φ = 804640.

The previous prime is 2011637. The next prime is 2011657. The reversal of 2011640 is 461102.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 25106 + ... + 25185.

2^2011640 is an apocalyptic number.

2011640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011640 is an abundant number, since it is smaller than the sum of its proper divisors (2514640).

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

2011640 is a wasteful number, since it uses less digits than its factorization.

2011640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50302 (or 50298 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2011640 is about 1418.3229533502. The cubic root of 2011640 is about 126.2360570166.

Adding to 2011640 its reverse (461102), we get a palindrome (2472742).

The spelling of 2011640 in words is "two million, eleven thousand, six hundred forty".