1188409 has 2 divisors, whose sum is σ = 1188410. Its totient is φ = 1188408.

The previous prime is 1188389. The next prime is 1188413. The reversal of 1188409 is 9048811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 896809 + 291600 = 947^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188409 - 2⁵ = 1188377 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1180409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594204 + 594205.

It is an arithmetic number, because the mean of its divisors is an integer number (594205).

2^1188409 is an apocalyptic number.

It is an amenable number.

1188409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188409 is an equidigital number, since it uses as much as digits as its factorization.

1188409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1188409 is about 1090.1417339044. The cubic root of 1188409 is about 105.9226028106.

The spelling of 1188409 in words is "one million, one hundred eighty-eight thousand, four hundred nine".