999880 has 32 divisors (see below), whose sum is σ = 2571840. Its totient is φ = 342720.

The previous prime is 999863. The next prime is 999883. The reversal of 999880 is 88999.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999883) by changing a digit.

999880 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1506 + ... + 2065.

It is an arithmetic number, because the mean of its divisors is an integer number (80370).

2⁹⁹⁹⁸⁸⁰ is an apocalyptic number.

It is an amenable number.

999880 is an abundant number, since it is smaller than the sum of its proper divisors (1571960).

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

999880 is a wasteful number, since it uses less digits than its factorization.

999880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589 (or 3585 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 999880 is about 999.9399981999. The cubic root of 999880 is about 99.9959998400.

The spelling of 999880 in words is "nine hundred ninety-nine thousand, eight hundred eighty".