999860 has 12 divisors (see below), whose sum is σ = 2099748. Its totient is φ = 399936.

The previous prime is 999853. The next prime is 999863. The reversal of 999860 is 68999.

999860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 512656 + 487204 = 716^2 + 698^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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 999860.

It is not an unprimeable number, because it can be changed into a prime (999863) by changing a digit.

999860 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 3 ways as a sum of consecutive naturals, for example, 24977 + ... + 25016.

It is an arithmetic number, because the mean of its divisors is an integer number (174979).

2⁹⁹⁹⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

999860 is an abundant number, since it is smaller than the sum of its proper divisors (1099888).

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

999860 is a wasteful number, since it uses less digits than its factorization.

999860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50002 (or 50000 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 999860 is about 999.9299975498. The cubic root of 999860 is about 99.9953331155.

The spelling of 999860 in words is "nine hundred ninety-nine thousand, eight hundred sixty".