998622 has 16 divisors (see below), whose sum is σ = 2219280. Its totient is φ = 332856.

The previous prime is 998617. The next prime is 998623. The reversal of 998622 is 226899.

It is a Smith number, since the sum of its digits (36) 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.

998622 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9193 + ... + 9300.

It is an arithmetic number, because the mean of its divisors is an integer number (138705).

2⁹⁹⁸⁶²² is an apocalyptic number.

998622 is an abundant number, since it is smaller than the sum of its proper divisors (1220658).

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

998622 is a wasteful number, since it uses less digits than its factorization.

998622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18504 (or 18498 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 998622 is about 999.3107624758. The cubic root of 998622 is about 99.9540455518.

The spelling of 998622 in words is "nine hundred ninety-eight thousand, six hundred twenty-two".