815998 has 8 divisors (see below), whose sum is σ = 1257192. Its totient is φ = 396936.

The previous prime is 815989. The next prime is 816019. The reversal of 815998 is 899518.

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

It is a self number, because there is not a number n which added to its sum of digits gives 815998.

It is a congruent number.

It is an unprimeable 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, 5440 + ... + 5587.

It is an arithmetic number, because the mean of its divisors is an integer number (157149).

2⁸¹⁵⁹⁹⁸ is an apocalyptic number.

815998 is a deficient number, since it is larger than the sum of its proper divisors (441194).

815998 is a wasteful number, since it uses less digits than its factorization.

815998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066.

The product of its digits is 25920, while the sum is 40.

The square root of 815998 is about 903.3260762316. The cubic root of 815998 is about 93.4464982218.

The spelling of 815998 in words is "eight hundred fifteen thousand, nine hundred ninety-eight".