1188421 has 8 divisors (see below), whose sum is σ = 1292760. Its totient is φ = 1085952.

The previous prime is 1188413. The next prime is 1188457. The reversal of 1188421 is 1248811.

It can be written as a sum of positive squares in 4 ways, for example, as 9025 + 1179396 = 95^2 + 1086^2 .

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 1188421 - 2³ = 1188413 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065 + ... + 1873.

It is an arithmetic number, because the mean of its divisors is an integer number (161595).

2^1188421 is an apocalyptic number.

It is an amenable number.

1188421 is a deficient number, since it is larger than the sum of its proper divisors (104339).

1188421 is a wasteful number, since it uses less digits than its factorization.

1188421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935.

The product of its digits is 512, while the sum is 25.

The square root of 1188421 is about 1090.1472377619. The cubic root of 1188421 is about 105.9229593284.

The spelling of 1188421 in words is "one million, one hundred eighty-eight thousand, four hundred twenty-one".