999258 has 32 divisors (see below), whose sum is σ = 2249856. Its totient is φ = 293568.

The previous prime is 999239. The next prime is 999269. The reversal of 999258 is 852999.

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 999258.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1516 + ... + 2072.

It is an arithmetic number, because the mean of its divisors is an integer number (70308).

2⁹⁹⁹²⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124928).

999258 is an abundant number, since it is smaller than the sum of its proper divisors (1250598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999258 is a wasteful number, since it uses less digits than its factorization.

999258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598.

The product of its digits is 58320, while the sum is 42.

The square root of 999258 is about 999.6289311540. The cubic root of 999258 is about 99.9752605468.

The spelling of 999258 in words is "nine hundred ninety-nine thousand, two hundred fifty-eight".