7285521 has 8 divisors (see below), whose sum is σ = 9731520. Its totient is φ = 4848272.

The previous prime is 7285519. The next prime is 7285529. The reversal of 7285521 is 1255827.

7285521 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7285521 - 2¹ = 7285519 is a prime.

7285521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7285529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100 + ... + 3818.

It is an arithmetic number, because the mean of its divisors is an integer number (1216440).

Almost surely, 2^7285521 is an apocalyptic number.

It is an amenable number.

7285521 is a deficient number, since it is larger than the sum of its proper divisors (2445999).

7285521 is a wasteful number, since it uses less digits than its factorization.

7285521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375.

The product of its digits is 5600, while the sum is 30.

The square root of 7285521 is about 2699.1704281131. The cubic root of 7285521 is about 193.8594032143.

The spelling of 7285521 in words is "seven million, two hundred eighty-five thousand, five hundred twenty-one".