9915906 has 96 divisors (see below), whose sum is σ = 26984448. Its totient is φ = 2358720.

The previous prime is 9915887. The next prime is 9915907. The reversal of 9915906 is 6095199.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9915907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78015 + ... + 78141.

It is an arithmetic number, because the mean of its divisors is an integer number (281088).

Almost surely, 2^9915906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9915906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13492224).

9915906 is an abundant number, since it is smaller than the sum of its proper divisors (17068542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9915906 is a wasteful number, since it uses less digits than its factorization.

9915906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 9915906 is about 3148.9531593849. The cubic root of 9915906 is about 214.8378514211.

The spelling of 9915906 in words is "nine million, nine hundred fifteen thousand, nine hundred six".