7920521 has 16 divisors (see below), whose sum is σ = 9694080. Its totient is φ = 6316800.

The previous prime is 7920481. The next prime is 7920529. The reversal of 7920521 is 1250297.

It is not a de Polignac number, because 7920521 - 2⁶ = 7920457 is a prime.

It is a super-2 number, since 2×7920521² = 125469305822882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7920529) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11690 + ... + 12348.

It is an arithmetic number, because the mean of its divisors is an integer number (605880).

Almost surely, 2^7920521 is an apocalyptic number.

It is an amenable number.

7920521 is a deficient number, since it is larger than the sum of its proper divisors (1773559).

7920521 is a wasteful number, since it uses less digits than its factorization.

7920521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 7920521 is about 2814.3420190162. The cubic root of 7920521 is about 199.3354694412.

The spelling of 7920521 in words is "seven million, nine hundred twenty thousand, five hundred twenty-one".