7420521 has 8 divisors (see below), whose sum is σ = 9906624. Its totient is φ = 4940720.

The previous prime is 7420519. The next prime is 7420529. The reversal of 7420521 is 1250247.

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 7420521 - 2¹ = 7420519 is a prime.

It is a super-2 number, since 2×7420521² = 110128263822882, which contains 22 as substring.

7420521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7420529) 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, 3715 + ... + 5351.

It is an arithmetic number, because the mean of its divisors is an integer number (1238328).

Almost surely, 2^7420521 is an apocalyptic number.

It is an amenable number.

7420521 is a deficient number, since it is larger than the sum of its proper divisors (2486103).

7420521 is a wasteful number, since it uses less digits than its factorization.

7420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 7420521 is about 2724.0633252551. The cubic root of 7420521 is about 195.0494811972.

Adding to 7420521 its reverse (1250247), we get a palindrome (8670768).

The spelling of 7420521 in words is "seven million, four hundred twenty thousand, five hundred twenty-one".