998140 has 48 divisors (see below), whose sum is σ = 2469600. Its totient is φ = 334080.

The previous prime is 998117. The next prime is 998147. The reversal of 998140 is 41899.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2686 + ... + 3034.

It is an arithmetic number, because the mean of its divisors is an integer number (51450).

2⁹⁹⁸¹⁴⁰ 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 998140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234800).

998140 is an abundant number, since it is smaller than the sum of its proper divisors (1471460).

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

998140 is a wasteful number, since it uses less digits than its factorization.

998140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 998140 is about 999.0695671474. The cubic root of 998140 is about 99.9379615202.

The spelling of 998140 in words is "nine hundred ninety-eight thousand, one hundred forty".