2040640 has 56 divisors (see below), whose sum is σ = 5559552. Its totient is φ = 698880.

The previous prime is 2040607. The next prime is 2040641. The reversal of 2040640 is 460402.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2040641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1785 + ... + 2695.

2^2040640 is an apocalyptic number.

2040640 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 2040640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2779776).

2040640 is an abundant number, since it is smaller than the sum of its proper divisors (3518912).

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

2040640 is an equidigital number, since it uses as much as digits as its factorization.

2040640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 2040640 is about 1428.5097129526. The cubic root of 2040640 is about 126.8397756244.

The spelling of 2040640 in words is "two million, forty thousand, six hundred forty".