998620 has 36 divisors (see below), whose sum is σ = 2441880. Its totient is φ = 342048.

The previous prime is 998617. The next prime is 998623. The reversal of 998620 is 26899.

It is an interprime number because it is at equal distance from previous prime (998617) and next prime (998623).

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998623) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 471 + ... + 1489.

It is an arithmetic number, because the mean of its divisors is an integer number (67830).

2⁹⁹⁸⁶²⁰ 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 998620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1220940).

998620 is an abundant number, since it is smaller than the sum of its proper divisors (1443260).

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

998620 is a wasteful number, since it uses less digits than its factorization.

998620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 998620 is about 999.3097617856. The cubic root of 998620 is about 99.9539788238.

The spelling of 998620 in words is "nine hundred ninety-eight thousand, six hundred twenty".