999544 has 32 divisors (see below), whose sum is σ = 2308320. Its totient is φ = 395136.

The previous prime is 999541. The next prime is 999553. The reversal of 999544 is 445999.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999497 and 999506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42 + ... + 1414.

It is an arithmetic number, because the mean of its divisors is an integer number (72135).

2⁹⁹⁹⁵⁴⁴ 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 999544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1154160).

999544 is an abundant number, since it is smaller than the sum of its proper divisors (1308776).

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

999544 is a wasteful number, since it uses less digits than its factorization.

999544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1395 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The square root of 999544 is about 999.7719740021. The cubic root of 999544 is about 99.9847976890.

The spelling of 999544 in words is "nine hundred ninety-nine thousand, five hundred forty-four".