1091838 has 32 divisors (see below), whose sum is σ = 2426112. Its totient is φ = 324800.

The previous prime is 1091837. The next prime is 1091843. The reversal of 1091838 is 8381901.

It is a super-2 number, since 2×1091838² = 2384220436488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4570 + ... + 4802.

It is an arithmetic number, because the mean of its divisors is an integer number (75816).

2^1091838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1213056).

1091838 is an abundant number, since it is smaller than the sum of its proper divisors (1334274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091838 is a wasteful number, since it uses less digits than its factorization.

1091838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1091838 is about 1044.9105224851. The cubic root of 1091838 is about 102.9720601629.

The spelling of 1091838 in words is "one million, ninety-one thousand, eight hundred thirty-eight".