8398939 has 4 divisors (see below), whose sum is σ = 8485624. Its totient is φ = 8312256.

The previous prime is 8398937. The next prime is 8398961. The reversal of 8398939 is 9398938.

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

It is a cyclic number.

It is not a de Polignac number, because 8398939 - 2¹ = 8398937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8398892 and 8398901.

It is not an unprimeable number, because it can be changed into a prime (8398937) 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, 43197 + ... + 43390.

It is an arithmetic number, because the mean of its divisors is an integer number (2121406).

Almost surely, 2^8398939 is an apocalyptic number.

8398939 is a deficient number, since it is larger than the sum of its proper divisors (86685).

8398939 is an equidigital number, since it uses as much as digits as its factorization.

8398939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86684.

The product of its digits is 419904, while the sum is 49.

The square root of 8398939 is about 2898.0923035680. The cubic root of 8398939 is about 203.2707122999.

Subtracting 8398939 from its reverse (9398938), we obtain a palindrome (999999).

The spelling of 8398939 in words is "eight million, three hundred ninety-eight thousand, nine hundred thirty-nine".