999998958 has 24 divisors (see below), whose sum is σ = 2326528872. Its totient is φ = 285713904.

The previous prime is 999998957. The next prime is 999998959. The reversal of 999998958 is 859899999.

It is an interprime number because it is at equal distance from previous prime (999998957) and next prime (999998959).

It is a self number, because there is not a number n which added to its sum of digits gives 999998958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1700385 + ... + 1700972.

It is an arithmetic number, because the mean of its divisors is an integer number (96938703).

Almost surely, 2^999998958 is an apocalyptic number.

999998958 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

999998958 is an abundant number, since it is smaller than the sum of its proper divisors (1326529914).

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

999998958 is a wasteful number, since it uses less digits than its factorization.

999998958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3401376 (or 3401369 counting only the distinct ones).

The product of its digits is 170061120, while the sum is 75.

The square root of 999998958 is about 31622.7601262129. The cubic root of 999998958 is about 999.9996526665. Note that the first 3 decimals are identical.

The spelling of 999998958 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred fifty-eight".