996840 has 128 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 241920.

The previous prime is 996811. The next prime is 996841. The reversal of 996840 is 48699.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 996795 and 996804.

It is not an unprimeable number, because it can be changed into a prime (996841) by changing a digit.

996840 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 31 ways as a sum of consecutive naturals, for example, 14005 + ... + 14075.

It is an arithmetic number, because the mean of its divisors is an integer number (28350).

2⁹⁹⁶⁸⁴⁰ is an apocalyptic number.

996840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 996840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814400).

996840 is an abundant number, since it is smaller than the sum of its proper divisors (2631960).

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

996840 is a wasteful number, since it uses less digits than its factorization.

996840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 996840 is about 998.4187498239. The cubic root of 996840 is about 99.8945555204.

The spelling of 996840 in words is "nine hundred ninety-six thousand, eight hundred forty".