8109939 has 4 divisors (see below), whose sum is σ = 10813256. Its totient is φ = 5406624.

The previous prime is 8109917. The next prime is 8109967. The reversal of 8109939 is 9399018.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8109939 - 2⁸ = 8109683 is a prime.

It is a super-2 number, since 2×8109939² = 131542221167442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8109897 and 8109906.

It is not an unprimeable number, because it can be changed into a prime (8109139) 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, 1351654 + ... + 1351659.

It is an arithmetic number, because the mean of its divisors is an integer number (2703314).

Almost surely, 2^8109939 is an apocalyptic number.

8109939 is a deficient number, since it is larger than the sum of its proper divisors (2703317).

8109939 is a wasteful number, since it uses less digits than its factorization.

8109939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703316.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 8109939 is about 2847.7954631609. The cubic root of 8109939 is about 200.9119933528.

The spelling of 8109939 in words is "eight million, one hundred nine thousand, nine hundred thirty-nine".