998569 has 8 divisors (see below), whose sum is σ = 1173312. Its totient is φ = 837840.

The previous prime is 998561. The next prime is 998617. The reversal of 998569 is 965899.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 998569 - 2³ = 998561 is a prime.

It is a super-4 number, since 4×998569⁴ (a number of 25 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3349 + ... + 3634.

It is an arithmetic number, because the mean of its divisors is an integer number (146664).

2⁹⁹⁸⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

998569 is a deficient number, since it is larger than the sum of its proper divisors (174743).

998569 is a wasteful number, since it uses less digits than its factorization.

998569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007.

The product of its digits is 174960, while the sum is 46.

The square root of 998569 is about 999.2842438466. The cubic root of 998569 is about 99.9522772290.

It can be divided in two parts, 99856 and 9, that multiplied together give a square (898704 = 948²).

The spelling of 998569 in words is "nine hundred ninety-eight thousand, five hundred sixty-nine".