105839999 has 4 divisors (see below), whose sum is σ = 107289936. Its totient is φ = 104390064.

The previous prime is 105839969. The next prime is 105840001. The reversal of 105839999 is 999938501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999938501 = 23 ⋅43475587.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105839999 is a prime.

It is a super-2 number, since 2×105839999² = 22404210776640002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105839999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105839939) 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, 724859 + ... + 725004.

It is an arithmetic number, because the mean of its divisors is an integer number (26822484).

Almost surely, 2^105839999 is an apocalyptic number.

105839999 is a deficient number, since it is larger than the sum of its proper divisors (1449937).

105839999 is an equidigital number, since it uses as much as digits as its factorization.

105839999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449936.

The product of its (nonzero) digits is 787320, while the sum is 53.

The square root of 105839999 is about 10287.8568710884. The cubic root of 105839999 is about 473.0241082966.

The spelling of 105839999 in words is "one hundred five million, eight hundred thirty-nine thousand, nine hundred ninety-nine".