998641 has 8 divisors (see below), whose sum is σ = 1149120. Its totient is φ = 850128.

The previous prime is 998633. The next prime is 998651. The reversal of 998641 is 146899.

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

It is a cyclic number.

It is not a de Polignac number, because 998641 - 2³ = 998633 is a prime.

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 998641.

It is not an unprimeable number, because it can be changed into a prime (998651) 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, 855 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (143640).

2⁹⁹⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

998641 is a deficient number, since it is larger than the sum of its proper divisors (150479).

998641 is a wasteful number, since it uses less digits than its factorization.

998641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983.

The product of its digits is 15552, while the sum is 37.

The square root of 998641 is about 999.3202689829. The cubic root of 998641 is about 99.9546794636.

The spelling of 998641 in words is "nine hundred ninety-eight thousand, six hundred forty-one".