991260 has 36 divisors (see below), whose sum is σ = 3007368. Its totient is φ = 264288.

The previous prime is 991229. The next prime is 991261. The reversal of 991260 is 62199.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991261) by changing a digit.

991260 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 11 ways as a sum of consecutive naturals, for example, 2574 + ... + 2933.

It is an arithmetic number, because the mean of its divisors is an integer number (83538).

2⁹⁹¹²⁶⁰ is an apocalyptic number.

991260 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

991260 is an abundant number, since it is smaller than the sum of its proper divisors (2016108).

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

991260 is a wasteful number, since it uses less digits than its factorization.

991260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522 (or 5517 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 991260 is about 995.6204095939. The cubic root of 991260 is about 99.7078137702.

The spelling of 991260 in words is "nine hundred ninety-one thousand, two hundred sixty".