998416821 has 16 divisors (see below), whose sum is σ = 1412651520. Its totient is φ = 625878000.

The previous prime is 998416759. The next prime is 998416823. The reversal of 998416821 is 128614899.

998416821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 998416821 - 2¹⁴ = 998400437 is a prime.

It is a super-2 number, since 2×998416821² = 1993672296911492082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998416823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118555 + ... + 126696.

It is an arithmetic number, because the mean of its divisors is an integer number (88290720).

Almost surely, 2^998416821 is an apocalyptic number.

It is an amenable number.

998416821 is a deficient number, since it is larger than the sum of its proper divisors (414234699).

998416821 is a wasteful number, since it uses less digits than its factorization.

998416821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245336.

The product of its digits is 248832, while the sum is 48.

The square root of 998416821 is about 31597.7344282782. The cubic root of 998416821 is about 999.4719949264.

The spelling of 998416821 in words is "nine hundred ninety-eight million, four hundred sixteen thousand, eight hundred twenty-one".