9916815 has 8 divisors (see below), whose sum is σ = 15866928. Its totient is φ = 5288960.

The previous prime is 9916813. The next prime is 9916843. The reversal of 9916815 is 5186199.

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

It is not a de Polignac number, because 9916815 - 2¹ = 9916813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9916813) 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 7 ways as a sum of consecutive naturals, for example, 330546 + ... + 330575.

It is an arithmetic number, because the mean of its divisors is an integer number (1983366).

Almost surely, 2^9916815 is an apocalyptic number.

9916815 is a deficient number, since it is larger than the sum of its proper divisors (5950113).

9916815 is a wasteful number, since it uses less digits than its factorization.

9916815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661129.

The product of its digits is 19440, while the sum is 39.

The square root of 9916815 is about 3149.0974897580. The cubic root of 9916815 is about 214.8444160134.

It can be divided in two parts, 9916 and 815, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 9916815 in words is "nine million, nine hundred sixteen thousand, eight hundred fifteen".