9915915 has 8 divisors (see below), whose sum is σ = 15865488. Its totient is φ = 5288480.

The previous prime is 9915911. The next prime is 9915937. The reversal of 9915915 is 5195199.

9915915 is digitally balanced in base 2 and base 4, because in such bases 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 not a de Polignac number, because 9915915 - 2² = 9915911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9915911) 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, 330516 + ... + 330545.

It is an arithmetic number, because the mean of its divisors is an integer number (1983186).

Almost surely, 2^9915915 is an apocalyptic number.

9915915 is a deficient number, since it is larger than the sum of its proper divisors (5949573).

9915915 is a wasteful number, since it uses less digits than its factorization.

9915915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661069.

The product of its digits is 18225, while the sum is 39.

The square root of 9915915 is about 3148.9545884309. The cubic root of 9915915 is about 214.8379164190.

The spelling of 9915915 in words is "nine million, nine hundred fifteen thousand, nine hundred fifteen".