991700 has 36 divisors (see below), whose sum is σ = 2208192. Its totient is φ = 386400.

The previous prime is 991693. The next prime is 991703. The reversal of 991700 is 7199.

991700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 991700.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991700.

It is not an unprimeable number, because it can be changed into a prime (991703) by changing a digit.

991700 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, 4595 + ... + 4805.

2⁹⁹¹⁷⁰⁰ 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 991700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104096).

991700 is an abundant number, since it is smaller than the sum of its proper divisors (1216492).

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

991700 is a wasteful number, since it uses less digits than its factorization.

991700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 991700 is about 995.8413528268. The cubic root of 991700 is about 99.7225643397.

Adding to 991700 its reverse (7199), we get a palindrome (998899).

The spelling of 991700 in words is "nine hundred ninety-one thousand, seven hundred".