4402521 has 12 divisors (see below), whose sum is σ = 6467760. Its totient is φ = 2884920.

The previous prime is 4402513. The next prime is 4402543. The reversal of 4402521 is 1252044.

It is not a de Polignac number, because 4402521 - 2³ = 4402513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4402494 and 4402503.

It is not an unprimeable number, because it can be changed into a prime (4402501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3615 + ... + 4676.

It is an arithmetic number, because the mean of its divisors is an integer number (538980).

Almost surely, 2^4402521 is an apocalyptic number.

It is an amenable number.

4402521 is a deficient number, since it is larger than the sum of its proper divisors (2065239).

4402521 is a wasteful number, since it uses less digits than its factorization.

4402521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8356 (or 8353 counting only the distinct ones).

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

The square root of 4402521 is about 2098.2185300869. The cubic root of 4402521 is about 163.8955437348.

Adding to 4402521 its reverse (1252044), we get a palindrome (5654565).

The spelling of 4402521 in words is "four million, four hundred two thousand, five hundred twenty-one".