998838 has 32 divisors (see below), whose sum is σ = 2268000. Its totient is φ = 325728.

The previous prime is 998831. The next prime is 998839. The reversal of 998838 is 838899.

It is a junction number, because it is equal to n+sod(n) for n = 998793 and 998802.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 998838.

It is not an unprimeable number, because it can be changed into a prime (998831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2688 + ... + 3036.

It is an arithmetic number, because the mean of its divisors is an integer number (70875).

2⁹⁹⁸⁸³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1134000).

998838 is an abundant number, since it is smaller than the sum of its proper divisors (1269162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998838 is a wasteful number, since it uses less digits than its factorization.

998838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 407 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 998838 is about 999.4188311214. The cubic root of 998838 is about 99.9612516543.

The spelling of 998838 in words is "nine hundred ninety-eight thousand, eight hundred thirty-eight".