915998 has 8 divisors (see below), whose sum is σ = 1433808. Its totient is φ = 438064.

The previous prime is 915991. The next prime is 916031. The reversal of 915998 is 899519.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 915998.

It is not an unprimeable number, because it can be changed into a prime (915991) by changing a digit.

915998 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 in 3 ways as a sum of consecutive naturals, for example, 9911 + ... + 10002.

It is an arithmetic number, because the mean of its divisors is an integer number (179226).

2⁹¹⁵⁹⁹⁸ is an apocalyptic number.

915998 is a deficient number, since it is larger than the sum of its proper divisors (517810).

915998 is a wasteful number, since it uses less digits than its factorization.

915998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19938.

The product of its digits is 29160, while the sum is 41.

The square root of 915998 is about 957.0778442739. The cubic root of 915998 is about 97.1176522597.

The spelling of 915998 in words is "nine hundred fifteen thousand, nine hundred ninety-eight".