998959 has 12 divisors (see below), whose sum is σ = 1133136. Its totient is φ = 878592.

The previous prime is 998957. The next prime is 998969. The reversal of 998959 is 959899.

It is not a de Polignac number, because 998959 - 2¹ = 998957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3759 + ... + 4015.

It is an arithmetic number, because the mean of its divisors is an integer number (94428).

2⁹⁹⁸⁹⁵⁹ is an apocalyptic number.

998959 is a deficient number, since it is larger than the sum of its proper divisors (134177).

998959 is a wasteful number, since it uses less digits than its factorization.

998959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 293 counting only the distinct ones).

The product of its digits is 262440, while the sum is 49.

The square root of 998959 is about 999.4793644693. The cubic root of 998959 is about 99.9652879521.

Subtracting from 998959 its reverse (959899), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 998959 in words is "nine hundred ninety-eight thousand, nine hundred fifty-nine".