1991360 has 84 divisors (see below), whose sum is σ = 5559552. Its totient is φ = 677376.

The previous prime is 1991359. The next prime is 1991387. The reversal of 1991360 is 631991.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15617 + ... + 15743.

2^1991360 is an apocalyptic number.

1991360 is a gapful number since it is divisible by the number (10) 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 1991360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2779776).

1991360 is an abundant number, since it is smaller than the sum of its proper divisors (3568192).

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

1991360 is a wasteful number, since it uses less digits than its factorization.

1991360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1991360 is about 1411.1555548557. The cubic root of 1991360 is about 125.8104144722.

The spelling of 1991360 in words is "one million, nine hundred ninety-one thousand, three hundred sixty".