998945 has 8 divisors (see below), whose sum is σ = 1205160. Its totient is φ = 794880.

The previous prime is 998941. The next prime is 998947. The reversal of 998945 is 549899.

It can be written as a sum of positive squares in 4 ways, for example, as 222784 + 776161 = 472^2 + 881^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 998945 - 2² = 998941 is a prime.

It is a super-2 number, since 2×998945² = 1995782226050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 998896 and 998905.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 998945.

It is not an unprimeable number, because it can be changed into a prime (998941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 791 + ... + 1619.

It is an arithmetic number, because the mean of its divisors is an integer number (150645).

2⁹⁹⁸⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

998945 is a deficient number, since it is larger than the sum of its proper divisors (206215).

998945 is a wasteful number, since it uses less digits than its factorization.

998945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075.

The product of its digits is 116640, while the sum is 44.

The square root of 998945 is about 999.4723607984. The cubic root of 998945 is about 99.9648209591.

It can be divided in two parts, 99894 and 5, that added together give a palindrome (99899).

The spelling of 998945 in words is "nine hundred ninety-eight thousand, nine hundred forty-five".