998478 has 48 divisors (see below), whose sum is σ = 2476656. Its totient is φ = 288000.

The previous prime is 998471. The next prime is 998497. The reversal of 998478 is 874899.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998471) 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, 3853 + ... + 4103.

It is an arithmetic number, because the mean of its divisors is an integer number (51597).

2⁹⁹⁸⁴⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238328).

998478 is an abundant number, since it is smaller than the sum of its proper divisors (1478178).

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

998478 is a wasteful number, since it uses less digits than its factorization.

998478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 286 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 998478 is about 999.2387102189. The cubic root of 998478 is about 99.9492409062.

The spelling of 998478 in words is "nine hundred ninety-eight thousand, four hundred seventy-eight".