8736521 has 8 divisors (see below), whose sum is σ = 9323424. Its totient is φ = 8157760.

The previous prime is 8736509. The next prime is 8736529. The reversal of 8736521 is 1256378.

It is a happy number.

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 8736521 - 2¹⁴ = 8720137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8736529) 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, 266 + ... + 4188.

It is an arithmetic number, because the mean of its divisors is an integer number (1165428).

Almost surely, 2^8736521 is an apocalyptic number.

It is an amenable number.

8736521 is a deficient number, since it is larger than the sum of its proper divisors (586903).

8736521 is a wasteful number, since it uses less digits than its factorization.

8736521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071.

The product of its digits is 10080, while the sum is 32.

The square root of 8736521 is about 2955.7606466018. The cubic root of 8736521 is about 205.9583995551.

The spelling of 8736521 in words is "eight million, seven hundred thirty-six thousand, five hundred twenty-one".