999280 has 20 divisors (see below), whose sum is σ = 2323512. Its totient is φ = 399680.

The previous prime is 999269. The next prime is 999287. The reversal of 999280 is 82999.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999287) by changing a digit.

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, 6166 + ... + 6325.

2⁹⁹⁹²⁸⁰ is an apocalyptic number.

It is an amenable number.

999280 is an abundant number, since it is smaller than the sum of its proper divisors (1324232).

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

999280 is a wasteful number, since it uses less digits than its factorization.

999280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12504 (or 12498 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 999280 is about 999.6399351767. The cubic root of 999280 is about 99.9759942377.

The spelling of 999280 in words is "nine hundred ninety-nine thousand, two hundred eighty".