998440 has 32 divisors (see below), whose sum is σ = 2277000. Its totient is φ = 393984.

The previous prime is 998429. The next prime is 998443. The reversal of 998440 is 44899.

998440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 988036 + 10404 = 994^2 + 102^2 .

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 junction number, because it is equal to n+sod(n) for n = 998396 and 998405.

It is not an unprimeable number, because it can be changed into a prime (998443) by changing a digit.

998440 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, 4246 + ... + 4474.

2⁹⁹⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

998440 is an abundant number, since it is smaller than the sum of its proper divisors (1278560).

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

998440 is a wasteful number, since it uses less digits than its factorization.

998440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 998440 is about 999.2196955625. The cubic root of 998440 is about 99.9479729365.

The spelling of 998440 in words is "nine hundred ninety-eight thousand, four hundred forty".