11821788 has 120 divisors (see below), whose sum is σ = 35126784. Its totient is φ = 3434400.

The previous prime is 11821787. The next prime is 11821841. The reversal of 11821788 is 88712811.

11821788 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11821787) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 110431 + ... + 110537.

Almost surely, 2^11821788 is an apocalyptic number.

11821788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11821788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17563392).

11821788 is an abundant number, since it is smaller than the sum of its proper divisors (23304996).

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

11821788 is a wasteful number, since it uses less digits than its factorization.

11821788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 154 counting only the distinct ones).

The product of its digits is 7168, while the sum is 36.

The square root of 11821788 is about 3438.2827108893. The cubic root of 11821788 is about 227.8038479161.

The spelling of 11821788 in words is "eleven million, eight hundred twenty-one thousand, seven hundred eighty-eight".