11217823 has 4 divisors (see below), whose sum is σ = 11286808. Its totient is φ = 11148840.

The previous prime is 11217799. The next prime is 11217853. The reversal of 11217823 is 32871211.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11217823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11217853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34248 + ... + 34573.

It is an arithmetic number, because the mean of its divisors is an integer number (2821702).

Almost surely, 2^11217823 is an apocalyptic number.

11217823 is a deficient number, since it is larger than the sum of its proper divisors (68985).

11217823 is an equidigital number, since it uses as much as digits as its factorization.

11217823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68984.

The product of its digits is 672, while the sum is 25.

The square root of 11217823 is about 3349.3018675539. The cubic root of 11217823 is about 223.8564064288.

The spelling of 11217823 in words is "eleven million, two hundred seventeen thousand, eight hundred twenty-three".