998491 has 8 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 910272.

The previous prime is 998471. The next prime is 998497. The reversal of 998491 is 194899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998491 is a prime.

It is a Duffinian number.

998491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (998497) 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 7 ways as a sum of consecutive naturals, for example, 726 + ... + 1588.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

2⁹⁹⁸⁴⁹¹ is an apocalyptic number.

998491 is a deficient number, since it is larger than the sum of its proper divisors (90149).

998491 is a wasteful number, since it uses less digits than its factorization.

998491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its digits is 23328, while the sum is 40.

The square root of 998491 is about 999.2452151499. The cubic root of 998491 is about 99.9496746779.

The spelling of 998491 in words is "nine hundred ninety-eight thousand, four hundred ninety-one".