1188321 has 4 divisors (see below), whose sum is σ = 1584432. Its totient is φ = 792212.

The previous prime is 1188307. The next prime is 1188353. The reversal of 1188321 is 1238811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1188321 - 2⁵ = 1188289 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1188291 and 1188300.

It is not an unprimeable number, because it can be changed into a prime (1188361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198051 + ... + 198056.

It is an arithmetic number, because the mean of its divisors is an integer number (396108).

2^1188321 is an apocalyptic number.

It is an amenable number.

1188321 is a deficient number, since it is larger than the sum of its proper divisors (396111).

1188321 is an equidigital number, since it uses as much as digits as its factorization.

1188321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396110.

The product of its digits is 384, while the sum is 24.

The square root of 1188321 is about 1090.1013714330. The cubic root of 1188321 is about 105.9199882733.

The spelling of 1188321 in words is "one million, one hundred eighty-eight thousand, three hundred twenty-one".