999872 has 28 divisors (see below), whose sum is σ = 2103120. Its totient is φ = 470016.

The previous prime is 999863. The next prime is 999883. The reversal of 999872 is 278999.

It is a nialpdrome in base 10.

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 999872.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629 + ... + 1547.

2⁹⁹⁹⁸⁷² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1051560).

999872 is an abundant number, since it is smaller than the sum of its proper divisors (1103248).

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

999872 is a wasteful number, since it uses less digits than its factorization.

999872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948 (or 938 counting only the distinct ones).

The product of its digits is 81648, while the sum is 44.

The square root of 999872 is about 999.9359979519. The cubic root of 999872 is about 99.9957331513.

The spelling of 999872 in words is "nine hundred ninety-nine thousand, eight hundred seventy-two".