998718 has 48 divisors (see below), whose sum is σ = 2407680. Its totient is φ = 275184.

The previous prime is 998717. The next prime is 998737. The reversal of 998718 is 817899.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 998718.

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 998718.

It is not an unprimeable number, because it can be changed into a prime (998717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12603 + ... + 12681.

It is an arithmetic number, because the mean of its divisors is an integer number (50160).

2⁹⁹⁸⁷¹⁸ is an apocalyptic number.

998718 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 998718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203840).

998718 is an abundant number, since it is smaller than the sum of its proper divisors (1408962).

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

998718 is a wasteful number, since it uses less digits than its factorization.

998718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 134 counting only the distinct ones).

The product of its digits is 36288, while the sum is 42.

The square root of 998718 is about 999.3587944277. The cubic root of 998718 is about 99.9572483923.

The spelling of 998718 in words is "nine hundred ninety-eight thousand, seven hundred eighteen".