8398999 has 4 divisors (see below), whose sum is σ = 9598864. Its totient is φ = 7199136.

The previous prime is 8398997. The next prime is 8399011. The reversal of 8398999 is 9998938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9998938 = 2 ⋅4999469.

It is not a de Polignac number, because 8398999 - 2¹ = 8398997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8398993) 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, 599922 + ... + 599935.

It is an arithmetic number, because the mean of its divisors is an integer number (2399716).

Almost surely, 2^8398999 is an apocalyptic number.

8398999 is a deficient number, since it is larger than the sum of its proper divisors (1199865).

8398999 is a wasteful number, since it uses less digits than its factorization.

8398999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199864.

The product of its digits is 1259712, while the sum is 55.

The square root of 8398999 is about 2898.1026551867. The cubic root of 8398999 is about 203.2711963378.

The spelling of 8398999 in words is "eight million, three hundred ninety-eight thousand, nine hundred ninety-nine".