9834123905 has 4 divisors (see below), whose sum is σ = 11800948692. Its totient is φ = 7867299120.

The previous prime is 9834123829. The next prime is 9834123919. The reversal of 9834123905 is 5093214389.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5093214389 = 8369 ⋅608581.

It can be written as a sum of positive squares in 2 ways, for example, as 6607088656 + 3227035249 = 81284^2 + 56807^2 .

It is not a de Polignac number, because 9834123905 - 2²⁸ = 9565688449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983412386 + ... + 983412395.

It is an arithmetic number, because the mean of its divisors is an integer number (2950237173).

Almost surely, 2^9834123905 is an apocalyptic number.

It is an amenable number.

9834123905 is a deficient number, since it is larger than the sum of its proper divisors (1966824787).

9834123905 is a wasteful number, since it uses less digits than its factorization.

9834123905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966824786.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 9834123905 is about 99167.1513405523. The cubic root of 9834123905 is about 2142.4559035868.

The spelling of 9834123905 in words is "nine billion, eight hundred thirty-four million, one hundred twenty-three thousand, nine hundred five".