815988 has 24 divisors (see below), whose sum is σ = 1941408. Its totient is φ = 266656.

The previous prime is 815977. The next prime is 815989. The reversal of 815988 is 889518.

It is a super-2 number, since 2×815988² = 1331672832288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815989) by changing a digit.

815988 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6 + ... + 1277.

It is an arithmetic number, because the mean of its divisors is an integer number (80892).

2⁸¹⁵⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

815988 is an abundant number, since it is smaller than the sum of its proper divisors (1125420).

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

815988 is a wasteful number, since it uses less digits than its factorization.

815988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343 (or 1341 counting only the distinct ones).

The product of its digits is 23040, while the sum is 39.

The square root of 815988 is about 903.3205411148. The cubic root of 815988 is about 93.4461164934.

The spelling of 815988 in words is "eight hundred fifteen thousand, nine hundred eighty-eight".