998648 has 32 divisors (see below), whose sum is σ = 2268000. Its totient is φ = 402432.

The previous prime is 998633. The next prime is 998651. The reversal of 998648 is 846899.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 998599 and 998608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428 + ... + 1476.

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

2⁹⁹⁸⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1134000).

998648 is an abundant number, since it is smaller than the sum of its proper divisors (1269352).

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

998648 is a wasteful number, since it uses less digits than its factorization.

998648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079 (or 1075 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 998648 is about 999.3237713574. The cubic root of 998648 is about 99.9549130080.

The spelling of 998648 in words is "nine hundred ninety-eight thousand, six hundred forty-eight".