9959805 has 24 divisors (see below), whose sum is σ = 18016128. Its totient is φ = 5080416.

The previous prime is 9959801. The next prime is 9959827. The reversal of 9959805 is 5089599.

It is not a de Polignac number, because 9959805 - 2² = 9959801 is a prime.

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

It is an Ulam number.

9959805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9959801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3777 + ... + 5846.

It is an arithmetic number, because the mean of its divisors is an integer number (750672).

Almost surely, 2^9959805 is an apocalyptic number.

It is an amenable number.

9959805 is a deficient number, since it is larger than the sum of its proper divisors (8056323).

9959805 is a wasteful number, since it uses less digits than its factorization.

9959805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657 (or 9654 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The square root of 9959805 is about 3155.9158734035. The cubic root of 9959805 is about 215.1544230419.

The spelling of 9959805 in words is "nine million, nine hundred fifty-nine thousand, eight hundred five".