9919665 has 40 divisors (see below), whose sum is σ = 20328000. Its totient is φ = 4533408.

The previous prime is 9919607. The next prime is 9919667. The reversal of 9919665 is 5669199.

It is not a de Polignac number, because 9919665 - 2⁸ = 9919409 is a prime.

It is a super-3 number, since 3×9919665³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 9919665.

It is not an unprimeable number, because it can be changed into a prime (9919667) 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 39 ways as a sum of consecutive naturals, for example, 1086 + ... + 4584.

It is an arithmetic number, because the mean of its divisors is an integer number (508200).

Almost surely, 2^9919665 is an apocalyptic number.

It is an amenable number.

9919665 is an abundant number, since it is smaller than the sum of its proper divisors (10408335).

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

9919665 is a wasteful number, since it uses less digits than its factorization.

9919665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3523 (or 3514 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 9919665 is about 3149.5499678526. The cubic root of 9919665 is about 214.8649954682.

The spelling of 9919665 in words is "nine million, nine hundred nineteen thousand, six hundred sixty-five".