991360 has 32 divisors (see below), whose sum is σ = 2371500. Its totient is φ = 396288.

The previous prime is 991357. The next prime is 991381. The reversal of 991360 is 63199.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 968256 + 23104 = 984^2 + 152^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135 + ... + 1414.

2⁹⁹¹³⁶⁰ is an apocalyptic number.

It is an amenable number.

991360 is an abundant number, since it is smaller than the sum of its proper divisors (1380140).

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

991360 is a wasteful number, since it uses less digits than its factorization.

991360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568 (or 1556 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 991360 is about 995.6706282702. The cubic root of 991360 is about 99.7111665556.

The spelling of 991360 in words is "nine hundred ninety-one thousand, three hundred sixty".