999396 has 72 divisors (see below), whose sum is σ = 2830464. Its totient is φ = 295680.

The previous prime is 999389. The next prime is 999431. The reversal of 999396 is 693999.

It is a nude number because it is divisible by every one of its digits.

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 999396.

It is an unprimeable number.

999396 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 23 ways as a sum of consecutive naturals, for example, 14041 + ... + 14111.

It is an arithmetic number, because the mean of its divisors is an integer number (39312).

2⁹⁹⁹³⁹⁶ 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 999396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1415232).

999396 is an abundant number, since it is smaller than the sum of its proper divisors (1831068).

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

999396 is a wasteful number, since it uses less digits than its factorization.

999396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 116 counting only the distinct ones).

The product of its digits is 118098, while the sum is 45.

The square root of 999396 is about 999.6979543842. The cubic root of 999396 is about 99.9798626118.

The spelling of 999396 in words is "nine hundred ninety-nine thousand, three hundred ninety-six".