2081640 has 128 divisors (see below), whose sum is σ = 7257600. Its totient is φ = 472320.

The previous prime is 2081627. The next prime is 2081647. The reversal of 2081640 is 461802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25039 + ... + 25121.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2^2081640 is an apocalyptic number.

2081640 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 2081640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3628800).

2081640 is an abundant number, since it is smaller than the sum of its proper divisors (5175960).

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

2081640 is a wasteful number, since it uses less digits than its factorization.

2081640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 2081640 is about 1442.7889658574. The cubic root of 2081640 is about 127.6836262247.

The spelling of 2081640 in words is "two million, eighty-one thousand, six hundred forty".