9999605 has 32 divisors (see below), whose sum is σ = 15759360. Its totient is φ = 5901120.

The previous prime is 9999601. The next prime is 9999637. The reversal of 9999605 is 5069999.

9999605 = T₆₂ + T₆₃ + ... + T₃₉₁.

9999605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9999605 - 2² = 9999601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9999605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6632 + ... + 7998.

It is an arithmetic number, because the mean of its divisors is an integer number (492480).

Almost surely, 2^9999605 is an apocalyptic number.

9999605 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9999605 is a deficient number, since it is larger than the sum of its proper divisors (5759755).

9999605 is a wasteful number, since it uses less digits than its factorization.

9999605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409.

The product of its (nonzero) digits is 196830, while the sum is 47.

The square root of 9999605 is about 3162.2152045678. The cubic root of 9999605 is about 215.4406322935.

The spelling of 9999605 in words is "nine million, nine hundred ninety-nine thousand, six hundred five".