1198189 has 2 divisors, whose sum is σ = 1198190. Its totient is φ = 1198188.

The previous prime is 1198187. The next prime is 1198201. The reversal of 1198189 is 9818911.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 218089 = 990^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1198189 - 2¹ = 1198187 is a prime.

It is a super-4 number, since 4×1198189⁴ (a number of 25 digits) contains 4444 as substring.

Together with 1198187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1198187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599094 + 599095.

It is an arithmetic number, because the mean of its divisors is an integer number (599095).

2^1198189 is an apocalyptic number.

It is an amenable number.

1198189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198189 is an equidigital number, since it uses as much as digits as its factorization.

1198189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 37.

The square root of 1198189 is about 1094.6181982774. The cubic root of 1198189 is about 106.2123723738.

The spelling of 1198189 in words is "one million, one hundred ninety-eight thousand, one hundred eighty-nine".