11855811 has 8 divisors (see below), whose sum is σ = 17244864. Its totient is φ = 7185320.

The previous prime is 11855773. The next prime is 11855813.

11855811 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11855811 - 2⁶ = 11855747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11855813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179601 + ... + 179666.

It is an arithmetic number, because the mean of its divisors is an integer number (2155608).

Almost surely, 2^11855811 is an apocalyptic number.

11855811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11855811 is a deficient number, since it is larger than the sum of its proper divisors (5389053).

11855811 is a wasteful number, since it uses less digits than its factorization.

11855811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359281.

The product of its digits is 1600, while the sum is 30.

The square root of 11855811 is about 3443.2268295888. The cubic root of 11855811 is about 228.0221777442.

It can be divided in two parts, 1185 and 5811, that added together give a palindrome (6996).

The spelling of 11855811 in words is "eleven million, eight hundred fifty-five thousand, eight hundred eleven".