998258 has 4 divisors (see below), whose sum is σ = 1497390. Its totient is φ = 499128.

The previous prime is 998243. The next prime is 998273. The reversal of 998258 is 852899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 852899 = 241 ⋅3539.

It is an interprime number because it is at equal distance from previous prime (998243) and next prime (998273).

It can be written as a sum of positive squares in only one way, i.e., 946729 + 51529 = 973^2 + 227^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 998258.

It is an unprimeable number.

998258 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 249563 + ... + 249566.

2⁹⁹⁸²⁵⁸ is an apocalyptic number.

998258 is a deficient number, since it is larger than the sum of its proper divisors (499132).

998258 is a wasteful number, since it uses less digits than its factorization.

998258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499131.

The product of its digits is 51840, while the sum is 41.

The square root of 998258 is about 999.1286203488. The cubic root of 998258 is about 99.9418995833.

The spelling of 998258 in words is "nine hundred ninety-eight thousand, two hundred fifty-eight".