4020540 has 48 divisors (see below), whose sum is σ = 11376288. Its totient is φ = 1060864.

The previous prime is 4020529. The next prime is 4020563. The reversal of 4020540 is 450204.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6484 + ... + 7076.

It is an arithmetic number, because the mean of its divisors is an integer number (237006).

Almost surely, 2^4020540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4020540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5688144).

4020540 is an abundant number, since it is smaller than the sum of its proper divisors (7355748).

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

4020540 is a wasteful number, since it uses less digits than its factorization.

4020540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 4020540 is about 2005.1284248147. The cubic root of 4020540 is about 159.0113515886.

Adding to 4020540 its reverse (450204), we get a palindrome (4470744).

It can be divided in two parts, 4020 and 540, that added together give a triangular number (4560 = T₉₅).

The spelling of 4020540 in words is "four million, twenty thousand, five hundred forty".