4003540 has 12 divisors (see below), whose sum is σ = 8407476. Its totient is φ = 1601408.

The previous prime is 4003529. The next prime is 4003577. The reversal of 4003540 is 453004.

It can be written as a sum of positive squares in 2 ways, for example, as 777924 + 3225616 = 882^2 + 1796^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100069 + ... + 100108.

It is an arithmetic number, because the mean of its divisors is an integer number (700623).

Almost surely, 2^4003540 is an apocalyptic number.

It is an amenable number.

4003540 is an abundant number, since it is smaller than the sum of its proper divisors (4403936).

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

4003540 is a wasteful number, since it uses less digits than its factorization.

4003540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200186 (or 200184 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 4003540 is about 2000.8848042803. The cubic root of 4003540 is about 158.7869197203.

Adding to 4003540 its reverse (453004), we get a palindrome (4456544).

The spelling of 4003540 in words is "four million, three thousand, five hundred forty".