991206 has 24 divisors (see below), whose sum is σ = 2190240. Its totient is φ = 323856.

The previous prime is 991201. The next prime is 991217. The reversal of 991206 is 602199.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 991206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991201) by changing a digit.

991206 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, 435 + ... + 1473.

It is an arithmetic number, because the mean of its divisors is an integer number (91260).

2⁹⁹¹²⁰⁶ is an apocalyptic number.

991206 is an abundant number, since it is smaller than the sum of its proper divisors (1199034).

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

991206 is a wasteful number, since it uses less digits than its factorization.

991206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100 (or 1097 counting only the distinct ones).

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

The square root of 991206 is about 995.5932904555. The cubic root of 991206 is about 99.7060031724.

The spelling of 991206 in words is "nine hundred ninety-one thousand, two hundred six".