1189391 has 4 divisors (see below), whose sum is σ = 1359312. Its totient is φ = 1019472.

The previous prime is 1189387. The next prime is 1189403. The reversal of 1189391 is 1939811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1939811 = 823 ⋅2357.

It is a cyclic number.

It is not a de Polignac number, because 1189391 - 2² = 1189387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84950 + ... + 84963.

It is an arithmetic number, because the mean of its divisors is an integer number (339828).

2^1189391 is an apocalyptic number.

1189391 is a deficient number, since it is larger than the sum of its proper divisors (169921).

1189391 is an equidigital number, since it uses as much as digits as its factorization.

1189391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169920.

The product of its digits is 1944, while the sum is 32.

The square root of 1189391 is about 1090.5920410493. The cubic root of 1189391 is about 105.9517699181.

The spelling of 1189391 in words is "one million, one hundred eighty-nine thousand, three hundred ninety-one".