999960 has 64 divisors (see below), whose sum is σ = 3235680. Its totient is φ = 245760.

The previous prime is 999959. The next prime is 999961. The reversal of 999960 is 69999.

It is an interprime number because it is at equal distance from previous prime (999959) and next prime (999961).

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 999960.

It is not an unprimeable number, because it can be changed into a prime (999961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1240 + ... + 1880.

2⁹⁹⁹⁹⁶⁰ 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 999960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1617840).

999960 is an abundant number, since it is smaller than the sum of its proper divisors (2235720).

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

999960 is a wasteful number, since it uses less digits than its factorization.

999960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 999960 is about 999.9799998000. The cubic root of 999960 is about 99.9986666489.

The spelling of 999960 in words is "nine hundred ninety-nine thousand, nine hundred sixty".