8358721 has 4 divisors (see below), whose sum is σ = 9552832. Its totient is φ = 7164612.

The previous prime is 8358703. The next prime is 8358731. The reversal of 8358721 is 1278538.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1278538 = 2 ⋅639269.

It is not a de Polignac number, because 8358721 - 2¹⁷ = 8227649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8358731) 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 3 ways as a sum of consecutive naturals, for example, 597045 + ... + 597058.

It is an arithmetic number, because the mean of its divisors is an integer number (2388208).

Almost surely, 2^8358721 is an apocalyptic number.

It is an amenable number.

8358721 is a deficient number, since it is larger than the sum of its proper divisors (1194111).

8358721 is a wasteful number, since it uses less digits than its factorization.

8358721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194110.

The product of its digits is 13440, while the sum is 34.

The square root of 8358721 is about 2891.1452748003. The cubic root of 8358721 is about 202.9457416849.

The spelling of 8358721 in words is "eight million, three hundred fifty-eight thousand, seven hundred twenty-one".