2043540 has 36 divisors (see below), whose sum is σ = 6199284. Its totient is φ = 544896.

The previous prime is 2043539. The next prime is 2043541. The reversal of 2043540 is 453402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2043539) and next prime (2043541).

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 1397124 = 804^2 + 1182^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5497 + ... + 5856.

2^2043540 is an apocalyptic number.

2043540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2043540 is an abundant number, since it is smaller than the sum of its proper divisors (4155744).

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

2043540 is a wasteful number, since it uses less digits than its factorization.

2043540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11368 (or 11363 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 2043540 is about 1429.5243964340. The cubic root of 2043540 is about 126.8998321492.

Adding to 2043540 its reverse (453402), we get a palindrome (2496942).

The spelling of 2043540 in words is "two million, forty-three thousand, five hundred forty".