8121715 has 8 divisors (see below), whose sum is σ = 11138400. Its totient is φ = 5569152.

The previous prime is 8121709. The next prime is 8121727. The reversal of 8121715 is 5171218.

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 8121715 - 2⁷ = 8121587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8121715.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115990 + ... + 116059.

It is an arithmetic number, because the mean of its divisors is an integer number (1392300).

Almost surely, 2^8121715 is an apocalyptic number.

8121715 is a deficient number, since it is larger than the sum of its proper divisors (3016685).

8121715 is a wasteful number, since it uses less digits than its factorization.

8121715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232061.

The product of its digits is 560, while the sum is 25.

The square root of 8121715 is about 2849.8622773741. The cubic root of 8121715 is about 201.0091907714.

It can be divided in two parts, 8121 and 715, that added together give a square (8836 = 94²).

The spelling of 8121715 in words is "eight million, one hundred twenty-one thousand, seven hundred fifteen".