1991196 has 48 divisors (see below), whose sum is σ = 5241600. Its totient is φ = 653616.

The previous prime is 1991189. The next prime is 1991239. The reversal of 1991196 is 6911991.

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 1991196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11035 + ... + 11213.

It is an arithmetic number, because the mean of its divisors is an integer number (109200).

2^1991196 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 1991196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2620800).

1991196 is an abundant number, since it is smaller than the sum of its proper divisors (3250404).

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

1991196 is a wasteful number, since it uses less digits than its factorization.

1991196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 287 counting only the distinct ones).

The product of its digits is 4374, while the sum is 36.

The square root of 1991196 is about 1411.0974452532. The cubic root of 1991196 is about 125.8069606393.

It can be divided in two parts, 1991 and 196, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1991196 in words is "one million, nine hundred ninety-one thousand, one hundred ninety-six".