1191885 has 16 divisors (see below), whose sum is σ = 1921920. Its totient is φ = 630720.

The previous prime is 1191847. The next prime is 1191899. The reversal of 1191885 is 5881911.

It is not a de Polignac number, because 1191885 - 2⁶ = 1191821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2496 + ... + 2934.

It is an arithmetic number, because the mean of its divisors is an integer number (120120).

2^1191885 is an apocalyptic number.

1191885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1191885 is a deficient number, since it is larger than the sum of its proper divisors (730035).

1191885 is a wasteful number, since it uses less digits than its factorization.

1191885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628.

The product of its digits is 2880, while the sum is 33.

The square root of 1191885 is about 1091.7348579211. The cubic root of 1191885 is about 106.0257739628.

The spelling of 1191885 in words is "one million, one hundred ninety-one thousand, eight hundred eighty-five".