11911823 has 8 divisors (see below), whose sum is σ = 14851200. Its totient is φ = 9281880.

The previous prime is 11911813. The next prime is 11911829. The reversal of 11911823 is 32811911.

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 11911823 - 2⁴ = 11911807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11911792 and 11911801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11911829) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 77273 + ... + 77426.

It is an arithmetic number, because the mean of its divisors is an integer number (1856400).

Almost surely, 2^11911823 is an apocalyptic number.

11911823 is a deficient number, since it is larger than the sum of its proper divisors (2939377).

11911823 is a wasteful number, since it uses less digits than its factorization.

11911823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154717.

The product of its digits is 432, while the sum is 26.

The square root of 11911823 is about 3451.3508949395. The cubic root of 11911823 is about 228.3807056534.

The spelling of 11911823 in words is "eleven million, nine hundred eleven thousand, eight hundred twenty-three".