11781090 has 48 divisors (see below), whose sum is σ = 30820608. Its totient is φ = 3122208.

The previous prime is 11781089. The next prime is 11781139. The reversal of 11781090 is 9018711.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19777 + ... + 20363.

It is an arithmetic number, because the mean of its divisors is an integer number (642096).

Almost surely, 2^11781090 is an apocalyptic number.

11781090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11781090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15410304).

11781090 is an abundant number, since it is smaller than the sum of its proper divisors (19039518).

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

11781090 is a wasteful number, since it uses less digits than its factorization.

11781090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 11781090 is about 3432.3592469321. The cubic root of 11781090 is about 227.5421328398.

The spelling of 11781090 in words is "eleven million, seven hundred eighty-one thousand, ninety".