8152721 has 8 divisors (see below), whose sum is σ = 8524800. Its totient is φ = 7787520.

The previous prime is 8152709. The next prime is 8152747. The reversal of 8152721 is 1272518.

8152721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8152721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8152751) 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, 785 + ... + 4113.

It is an arithmetic number, because the mean of its divisors is an integer number (1065600).

Almost surely, 2^8152721 is an apocalyptic number.

It is an amenable number.

8152721 is a deficient number, since it is larger than the sum of its proper divisors (372079).

8152721 is a wasteful number, since it uses less digits than its factorization.

8152721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3439.

The product of its digits is 1120, while the sum is 26.

The square root of 8152721 is about 2855.2970073182. The cubic root of 8152721 is about 201.2646613034.

The spelling of 8152721 in words is "eight million, one hundred fifty-two thousand, seven hundred twenty-one".