998421684 has 24 divisors (see below), whose sum is σ = 2508854880. Its totient is φ = 307206624.

The previous prime is 998421673. The next prime is 998421689. The reversal of 998421684 is 486124899.

998421684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998421689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3199914 + ... + 3200225.

It is an arithmetic number, because the mean of its divisors is an integer number (104535620).

Almost surely, 2^998421684 is an apocalyptic number.

It is an amenable number.

998421684 is an abundant number, since it is smaller than the sum of its proper divisors (1510433196).

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

998421684 is a wasteful number, since it uses less digits than its factorization.

998421684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6400159 (or 6400157 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 998421684 is about 31597.8113799041. The cubic root of 998421684 is about 999.4736176369.

The spelling of 998421684 in words is "nine hundred ninety-eight million, four hundred twenty-one thousand, six hundred eighty-four".