2043640 has 32 divisors (see below), whose sum is σ = 4842000. Its totient is φ = 774144.

The previous prime is 2043637. The next prime is 2043647. The reversal of 2043640 is 463402.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043647) 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, 585 + ... + 2104.

2^2043640 is an apocalyptic number.

2043640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2043640 is an abundant number, since it is smaller than the sum of its proper divisors (2798360).

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

2043640 is a wasteful number, since it uses less digits than its factorization.

2043640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719 (or 2715 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 2043640 is about 1429.5593726740. The cubic root of 2043640 is about 126.9019020502.

It can be divided in two parts, 204 and 3640, that added together give a square (3844 = 62²).

The spelling of 2043640 in words is "two million, forty-three thousand, six hundred forty".