1091885 has 8 divisors (see below), whose sum is σ = 1321056. Its totient is φ = 866320.

The previous prime is 1091869. The next prime is 1091887. The reversal of 1091885 is 5881901.

It is a happy number.

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

It is not a de Polignac number, because 1091885 - 2⁴ = 1091869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179 + ... + 1488.

It is an arithmetic number, because the mean of its divisors is an integer number (165132).

2^1091885 is an apocalyptic number.

It is an amenable number.

1091885 is a deficient number, since it is larger than the sum of its proper divisors (229171).

1091885 is a wasteful number, since it uses less digits than its factorization.

1091885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 1091885 is about 1044.9330122070. The cubic root of 1091885 is about 102.9735376768.

The spelling of 1091885 in words is "one million, ninety-one thousand, eight hundred eighty-five".