1091860 has 48 divisors (see below), whose sum is σ = 2862720. Its totient is φ = 339840.

The previous prime is 1091843. The next prime is 1091863. The reversal of 1091860 is 681901.

1091860 = 113² + 114² + ... + 167².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091863) 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 15 ways as a sum of consecutive naturals, for example, 1186 + ... + 1894.

It is an arithmetic number, because the mean of its divisors is an integer number (59640).

2^1091860 is an apocalyptic number.

1091860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431360).

1091860 is an abundant number, since it is smaller than the sum of its proper divisors (1770860).

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

1091860 is a wasteful number, since it uses less digits than its factorization.

1091860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1091860 is about 1044.9210496492. The cubic root of 1091860 is about 102.9727517705.

The spelling of 1091860 in words is "one million, ninety-one thousand, eight hundred sixty".