4020534 has 48 divisors (see below), whose sum is σ = 10546848. Its totient is φ = 1080576.

The previous prime is 4020529. The next prime is 4020563. The reversal of 4020534 is 4350204.

It is a happy number.

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

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 23 ways as a sum of consecutive naturals, for example, 1204 + ... + 3080.

It is an arithmetic number, because the mean of its divisors is an integer number (219726).

Almost surely, 2^4020534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4020534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5273424).

4020534 is an abundant number, since it is smaller than the sum of its proper divisors (6526314).

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

4020534 is a wasteful number, since it uses less digits than its factorization.

4020534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909 (or 1906 counting only the distinct ones).

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

The square root of 4020534 is about 2005.1269286507. The cubic root of 4020534 is about 159.0112724890.

Adding to 4020534 its reverse (4350204), we get a palindrome (8370738).

It can be divided in two parts, 4020 and 534, that added together give a palindrome (4554).

The spelling of 4020534 in words is "four million, twenty thousand, five hundred thirty-four".