998545 has 16 divisors (see below), whose sum is σ = 1319040. Its totient is φ = 722304.

The previous prime is 998539. The next prime is 998551. The reversal of 998545 is 545899.

It is an interprime number because it is at equal distance from previous prime (998539) and next prime (998551).

It is not a de Polignac number, because 998545 - 2³ = 998537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998498 and 998507.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1957 + ... + 2413.

It is an arithmetic number, because the mean of its divisors is an integer number (82440).

2⁹⁹⁸⁵⁴⁵ is an apocalyptic number.

998545 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

998545 is a deficient number, since it is larger than the sum of its proper divisors (320495).

998545 is a wasteful number, since it uses less digits than its factorization.

998545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504.

The product of its digits is 64800, while the sum is 40.

The square root of 998545 is about 999.2722351792. The cubic root of 998545 is about 99.9514764585.

The spelling of 998545 in words is "nine hundred ninety-eight thousand, five hundred forty-five".