1188221 has 8 divisors (see below), whose sum is σ = 1236984. Its totient is φ = 1140480.

The previous prime is 1188197. The next prime is 1188223. The reversal of 1188221 is 1228811.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62500 + 1125721 = 250^2 + 1061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1188221 - 2¹⁴ = 1171837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2795 + ... + 3191.

It is an arithmetic number, because the mean of its divisors is an integer number (154623).

2^1188221 is an apocalyptic number.

It is an amenable number.

1188221 is a deficient number, since it is larger than the sum of its proper divisors (48763).

1188221 is an equidigital number, since it uses as much as digits as its factorization.

1188221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511.

The product of its digits is 256, while the sum is 23.

The square root of 1188221 is about 1090.0555031740. The cubic root of 1188221 is about 105.9170170514.

The spelling of 1188221 in words is "one million, one hundred eighty-eight thousand, two hundred twenty-one".