998686404 has 81 divisors (see below), whose sum is σ = 2650562733.
Its totient is φ = 317031264.
The previous prime is 998686399. The next prime is 998686411. The reversal of 998686404 is 404686899.
The square root of 998686404 is 31602.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 930128004 + 68558400 = 30498^2 + 8280^2
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4360962 + ... + 4361190.
Almost surely, 2998686404 is an apocalyptic number.
998686404 is the 31602-nd square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 998686404
998686404 is an abundant number, since it is smaller than the sum of its proper divisors (1651876329).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
998686404 is a wasteful number, since it uses less digits than its factorization.
998686404 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 514 (or 257 counting only the distinct ones).
The product of its (nonzero) digits is 2985984, while the sum is 54.
The cubic root of 998686404 is about 999.5619428006.
The spelling of 998686404 in words is "nine hundred ninety-eight million, six hundred eighty-six thousand, four hundred four".