1191895 has 8 divisors (see below), whose sum is σ = 1442304. Its totient is φ = 945504.

The previous prime is 1191847. The next prime is 1191899. The reversal of 1191895 is 5981911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1191895 - 2⁷ = 1191767 is a prime.

It is a super-2 number, since 2×1191895² = 2841227382050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1191895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304 + ... + 1573.

It is an arithmetic number, because the mean of its divisors is an integer number (180288).

2^1191895 is an apocalyptic number.

1191895 is a deficient number, since it is larger than the sum of its proper divisors (250409).

1191895 is a wasteful number, since it uses less digits than its factorization.

1191895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009.

The product of its digits is 3240, while the sum is 34.

The square root of 1191895 is about 1091.7394377781. The cubic root of 1191895 is about 106.0260704832.

The spelling of 1191895 in words is "one million, one hundred ninety-one thousand, eight hundred ninety-five".