998636 has 6 divisors (see below), whose sum is σ = 1747620. Its totient is φ = 499316.

The previous prime is 998633. The next prime is 998651. The reversal of 998636 is 636899.

It is a junction number, because it is equal to n+sod(n) for n = 998593 and 998602.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 998636.

It is not an unprimeable number, because it can be changed into a prime (998633) 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 as a sum of consecutive naturals, namely, 124826 + ... + 124833.

It is an arithmetic number, because the mean of its divisors is an integer number (291270).

2⁹⁹⁸⁶³⁶ is an apocalyptic number.

It is an amenable number.

998636 is a deficient number, since it is larger than the sum of its proper divisors (748984).

998636 is a wasteful number, since it uses less digits than its factorization.

998636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249663 (or 249661 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 998636 is about 999.3177672793. The cubic root of 998636 is about 99.9545126455.

The spelling of 998636 in words is "nine hundred ninety-eight thousand, six hundred thirty-six".