11111808 has 64 divisors (see below), whose sum is σ = 31089600. Its totient is φ = 3506688.

The previous prime is 11111777. The next prime is 11111809. The reversal of 11111808 is 80811111.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111809) 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, 6535 + ... + 8057.

It is an arithmetic number, because the mean of its divisors is an integer number (485775).

Almost surely, 2^11111808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11111808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15544800).

11111808 is an abundant number, since it is smaller than the sum of its proper divisors (19977792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111808 is a wasteful number, since it uses less digits than its factorization.

11111808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559 (or 1547 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 21.

The square root of 11111808 is about 3333.4378650276. The cubic root of 11111808 is about 223.1489818004.

Adding to 11111808 its reverse (80811111), we get a palindrome (91922919).

The spelling of 11111808 in words is "eleven million, one hundred eleven thousand, eight hundred eight".