11213823 has 4 divisors (see below), whose sum is σ = 14951768. Its totient is φ = 7475880.

The previous prime is 11213821. The next prime is 11213827. The reversal of 11213823 is 32831211.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11213823 - 2¹ = 11213821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11213823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868968 + ... + 1868973.

It is an arithmetic number, because the mean of its divisors is an integer number (3737942).

Almost surely, 2^11213823 is an apocalyptic number.

11213823 is a deficient number, since it is larger than the sum of its proper divisors (3737945).

11213823 is an equidigital number, since it uses as much as digits as its factorization.

11213823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3737944.

The product of its digits is 288, while the sum is 21.

The square root of 11213823 is about 3348.7046749452. The cubic root of 11213823 is about 223.8297960346.

The spelling of 11213823 in words is "eleven million, two hundred thirteen thousand, eight hundred twenty-three".