998365 has 4 divisors (see below), whose sum is σ = 1198044. Its totient is φ = 798688.

The previous prime is 998353. The next prime is 998377. The reversal of 998365 is 563899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563899 = 7 ⋅80557.

It is an interprime number because it is at equal distance from previous prime (998353) and next prime (998377).

It can be written as a sum of positive squares in 2 ways, for example, as 423801 + 574564 = 651^2 + 758^2 .

It is a cyclic number.

It is not a de Polignac number, because 998365 - 2⁷ = 998237 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

998365 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99832 + ... + 99841.

It is an arithmetic number, because the mean of its divisors is an integer number (299511).

2⁹⁹⁸³⁶⁵ is an apocalyptic number.

It is an amenable number.

998365 is a deficient number, since it is larger than the sum of its proper divisors (199679).

998365 is a wasteful number, since it uses less digits than its factorization.

998365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199678.

The product of its digits is 58320, while the sum is 40.

The square root of 998365 is about 999.1821655734. The cubic root of 998365 is about 99.9454702705.

It can be divided in two parts, 99 and 8365, that added together give a square (8464 = 92²).

The spelling of 998365 in words is "nine hundred ninety-eight thousand, three hundred sixty-five".