1000998 has 40 divisors (see below), whose sum is σ = 2317392. Its totient is φ = 322704.

The previous prime is 1000981. The next prime is 1000999. The reversal of 1000998 is 8990001.

1000998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000999) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5911 + ... + 6077.

2^1000998 is an apocalyptic number.

1000998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158696).

1000998 is an abundant number, since it is smaller than the sum of its proper divisors (1316394).

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

1000998 is a wasteful number, since it uses less digits than its factorization.

1000998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1000998 is about 1000.4988755616. The cubic root of 1000998 is about 100.0332556061.

Adding to 1000998 its reverse (8990001), we get a palindrome (9990999).

The spelling of 1000998 in words is "one million, nine hundred ninety-eight", and thus it is an aban number.