1188401 has 4 divisors (see below), whose sum is σ = 1191204. Its totient is φ = 1185600.

The previous prime is 1188389. The next prime is 1188409. The reversal of 1188401 is 1048811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1048811 = 149 ⋅7039.

It can be written as a sum of positive squares in 2 ways, for example, as 524176 + 664225 = 724^2 + 815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1188401 is a prime.

It is a Duffinian number.

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 (1188409) 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 3 ways as a sum of consecutive naturals, for example, 620 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (297801).

2^1188401 is an apocalyptic number.

It is an amenable number.

1188401 is a deficient number, since it is larger than the sum of its proper divisors (2803).

1188401 is an equidigital number, since it uses as much as digits as its factorization.

1188401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802.

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

The square root of 1188401 is about 1090.1380646505. The cubic root of 1188401 is about 105.9223651307.

The spelling of 1188401 in words is "one million, one hundred eighty-eight thousand, four hundred one".