7989521 has 8 divisors (see below), whose sum is σ = 8257704. Its totient is φ = 7724160.

The previous prime is 7989517. The next prime is 7989523. The reversal of 7989521 is 1259897.

It can be written as a sum of positive squares in 4 ways, for example, as 640000 + 7349521 = 800^2 + 2711^2 .

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 7989521 - 2² = 7989517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7989523) 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, 6101 + ... + 7293.

It is an arithmetic number, because the mean of its divisors is an integer number (1032213).

Almost surely, 2^7989521 is an apocalyptic number.

It is an amenable number.

7989521 is a deficient number, since it is larger than the sum of its proper divisors (268183).

7989521 is a wasteful number, since it uses less digits than its factorization.

7989521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411.

The product of its digits is 45360, while the sum is 41.

The square root of 7989521 is about 2826.5740747414. The cubic root of 7989521 is about 199.9126368440.

The spelling of 7989521 in words is "seven million, nine hundred eighty-nine thousand, five hundred twenty-one".