1091845 has 8 divisors (see below), whose sum is σ = 1320480. Its totient is φ = 866640.

The previous prime is 1091843. The next prime is 1091863. The reversal of 1091845 is 5481901.

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 1091845 - 2¹ = 1091843 is a prime.

1091845 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91 + ... + 1480.

It is an arithmetic number, because the mean of its divisors is an integer number (165060).

2^1091845 is an apocalyptic number.

It is an amenable number.

1091845 is a deficient number, since it is larger than the sum of its proper divisors (228635).

1091845 is a wasteful number, since it uses less digits than its factorization.

1091845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1091845 is about 1044.9138720488. The cubic root of 1091845 is about 102.9722802209.

It can be divided in two parts, 1091 and 845, that added together give a square (1936 = 44²).

The spelling of 1091845 in words is "one million, ninety-one thousand, eight hundred forty-five".