4042521 has 32 divisors (see below), whose sum is σ = 6961920. Its totient is φ = 2270592.

The previous prime is 4042501. The next prime is 4042523. The reversal of 4042521 is 1252404.

It is not a de Polignac number, because 4042521 - 2⁷ = 4042393 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4042494 and 4042503.

It is not an unprimeable number, because it can be changed into a prime (4042523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13651 + ... + 13943.

It is an arithmetic number, because the mean of its divisors is an integer number (217560).

Almost surely, 2^4042521 is an apocalyptic number.

It is an amenable number.

4042521 is a deficient number, since it is larger than the sum of its proper divisors (2919399).

4042521 is a wasteful number, since it uses less digits than its factorization.

4042521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 4042521 is about 2010.6021486112. The cubic root of 4042521 is about 159.3006061099.

Adding to 4042521 its reverse (1252404), we get a palindrome (5294925).

The spelling of 4042521 in words is "four million, forty-two thousand, five hundred twenty-one".