998540 has 12 divisors (see below), whose sum is σ = 2096976. Its totient is φ = 399408.

The previous prime is 998539. The next prime is 998551. The reversal of 998540 is 45899.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 998540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24944 + ... + 24983.

It is an arithmetic number, because the mean of its divisors is an integer number (174748).

2⁹⁹⁸⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

998540 is an abundant number, since it is smaller than the sum of its proper divisors (1098436).

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

998540 is a wasteful number, since it uses less digits than its factorization.

998540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49936 (or 49934 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 998540 is about 999.2697333553. The cubic root of 998540 is about 99.9513096297.

The spelling of 998540 in words is "nine hundred ninety-eight thousand, five hundred forty".