9903665 has 8 divisors (see below), whose sum is σ = 11936808. Its totient is φ = 7888000.

The previous prime is 9903623. The next prime is 9903671. The reversal of 9903665 is 5663099.

9903665 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 69169 + 9834496 = 263^2 + 3136^2 .

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

It is not a de Polignac number, because 9903665 - 2²⁰ = 8855089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3086 + ... + 5415.

It is an arithmetic number, because the mean of its divisors is an integer number (1492101).

Almost surely, 2^9903665 is an apocalyptic number.

It is an amenable number.

9903665 is a deficient number, since it is larger than the sum of its proper divisors (2033143).

9903665 is a wasteful number, since it uses less digits than its factorization.

9903665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8739.

The product of its (nonzero) digits is 43740, while the sum is 38.

The square root of 9903665 is about 3147.0088973500. The cubic root of 9903665 is about 214.7494105854.

The spelling of 9903665 in words is "nine million, nine hundred three thousand, six hundred sixty-five".