998745 has 16 divisors (see below), whose sum is σ = 1743552. Its totient is φ = 484160.

The previous prime is 998743. The next prime is 998749. The reversal of 998745 is 547899.

It is not a de Polignac number, because 998745 - 2¹ = 998743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998697 and 998706.

It is not an unprimeable number, because it can be changed into a prime (998743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2862 + ... + 3191.

It is an arithmetic number, because the mean of its divisors is an integer number (108972).

2⁹⁹⁸⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

998745 is a deficient number, since it is larger than the sum of its proper divisors (744807).

998745 is a wasteful number, since it uses less digits than its factorization.

998745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6072.

The product of its digits is 90720, while the sum is 42.

The square root of 998745 is about 999.3723029982. The cubic root of 998745 is about 99.9581491542.

The spelling of 998745 in words is "nine hundred ninety-eight thousand, seven hundred forty-five".