998634 has 64 divisors (see below), whose sum is σ = 2580480. Its totient is φ = 250560.

The previous prime is 998633. The next prime is 998651. The reversal of 998634 is 436899.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 998592 and 998601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998633) 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 31 ways as a sum of consecutive naturals, for example, 16897 + ... + 16955.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2⁹⁹⁸⁶³⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1290240).

998634 is an abundant number, since it is smaller than the sum of its proper divisors (1581846).

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

998634 is a wasteful number, since it uses less digits than its factorization.

998634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115.

The product of its digits is 46656, while the sum is 39.

The square root of 998634 is about 999.3167665961. The cubic root of 998634 is about 99.9544459181.

The spelling of 998634 in words is "nine hundred ninety-eight thousand, six hundred thirty-four".