7986521 has 4 divisors (see below), whose sum is σ = 8017152. Its totient is φ = 7955892.

The previous prime is 7986463. The next prime is 7986529. The reversal of 7986521 is 1256897.

7986521 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7986521 - 2⁶ = 7986457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7986529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14921 + ... + 15446.

It is an arithmetic number, because the mean of its divisors is an integer number (2004288).

Almost surely, 2^7986521 is an apocalyptic number.

It is an amenable number.

7986521 is a deficient number, since it is larger than the sum of its proper divisors (30631).

7986521 is a wasteful number, since it uses less digits than its factorization.

7986521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30630.

The product of its digits is 30240, while the sum is 38.

The square root of 7986521 is about 2826.0433471552. The cubic root of 7986521 is about 199.8876118564.

The spelling of 7986521 in words is "seven million, nine hundred eighty-six thousand, five hundred twenty-one".