9905899 has 4 divisors (see below), whose sum is σ = 10173664. Its totient is φ = 9638136.

The previous prime is 9905891. The next prime is 9905911. The reversal of 9905899 is 9985099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9985099 = 41 ⋅243539.

It is a cyclic number.

It is not a de Polignac number, because 9905899 - 2³ = 9905891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9905891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133827 + ... + 133900.

It is an arithmetic number, because the mean of its divisors is an integer number (2543416).

Almost surely, 2^9905899 is an apocalyptic number.

9905899 is a deficient number, since it is larger than the sum of its proper divisors (267765).

9905899 is a wasteful number, since it uses less digits than its factorization.

9905899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267764.

The product of its (nonzero) digits is 262440, while the sum is 49.

The square root of 9905899 is about 3147.3638175464. The cubic root of 9905899 is about 214.7655565985.

It can be divided in two parts, 990 and 5899, that added together give a square (6889 = 83²).

The spelling of 9905899 in words is "nine million, nine hundred five thousand, eight hundred ninety-nine".