11681805 has 32 divisors (see below), whose sum is σ = 20141568. Its totient is φ = 5760000.

The previous prime is 11681801. The next prime is 11681833. The reversal of 11681805 is 50818611.

It is a happy number.

It is not a de Polignac number, because 11681805 - 2² = 11681801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11681801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15180 + ... + 15930.

It is an arithmetic number, because the mean of its divisors is an integer number (629424).

Almost surely, 2^11681805 is an apocalyptic number.

11681805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11681805 is a deficient number, since it is larger than the sum of its proper divisors (8459763).

11681805 is a wasteful number, since it uses less digits than its factorization.

11681805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 11681805 is about 3417.8655620138. The cubic root of 11681805 is about 226.9011258608.

The spelling of 11681805 in words is "eleven million, six hundred eighty-one thousand, eight hundred five".