998799 has 4 divisors (see below), whose sum is σ = 1331736. Its totient is φ = 665864.

The previous prime is 998779. The next prime is 998813. The reversal of 998799 is 997899.

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 998799 - 2⁹ = 998287 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998749) 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, 166464 + ... + 166469.

It is an arithmetic number, because the mean of its divisors is an integer number (332934).

2⁹⁹⁸⁷⁹⁹ is an apocalyptic number.

998799 is a deficient number, since it is larger than the sum of its proper divisors (332937).

998799 is a wasteful number, since it uses less digits than its factorization.

998799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332936.

The product of its digits is 367416, while the sum is 51.

The square root of 998799 is about 999.3993195915. The cubic root of 998799 is about 99.9599506293.

Subtracting from 998799 its reverse (997899), we obtain a square (900 = 30²).

The spelling of 998799 in words is "nine hundred ninety-eight thousand, seven hundred ninety-nine".