998305 has 16 divisors (see below), whose sum is σ = 1494144. Its totient is φ = 622080.

The previous prime is 998287. The next prime is 998311. The reversal of 998305 is 503899.

It is not a de Polignac number, because 998305 - 2⁵ = 998273 is a prime.

It is a super-2 number, since 2×998305² = 1993225746050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 912 + ... + 1681.

It is an arithmetic number, because the mean of its divisors is an integer number (93384).

2⁹⁹⁸³⁰⁵ is an apocalyptic number.

It is an amenable number.

998305 is a deficient number, since it is larger than the sum of its proper divisors (495839).

998305 is a wasteful number, since it uses less digits than its factorization.

998305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 998305 is about 999.1521405672. The cubic root of 998305 is about 99.9434680474.

The spelling of 998305 in words is "nine hundred ninety-eight thousand, three hundred five".