1188641 has 4 divisors (see below), whose sum is σ = 1191300. Its totient is φ = 1185984.

The previous prime is 1188637. The next prime is 1188653. The reversal of 1188641 is 1468811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1468811 = 31 ⋅47381.

It can be written as a sum of positive squares in 2 ways, for example, as 633616 + 555025 = 796^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188641 - 2² = 1188637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1188601) 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, 476 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (297825).

2^1188641 is an apocalyptic number.

It is an amenable number.

1188641 is a deficient number, since it is larger than the sum of its proper divisors (2659).

1188641 is an equidigital number, since it uses as much as digits as its factorization.

1188641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658.

The product of its digits is 1536, while the sum is 29.

The square root of 1188641 is about 1090.2481368936. The cubic root of 1188641 is about 105.9294950632.

The spelling of 1188641 in words is "one million, one hundred eighty-eight thousand, six hundred forty-one".