11821338 has 12 divisors (see below), whose sum is σ = 25612938. Its totient is φ = 3940440.

The previous prime is 11821331. The next prime is 11821349. The reversal of 11821338 is 83312811.

It can be written as a sum of positive squares in only one way, i.e., 10712529 + 1108809 = 3273^2 + 1053^2 .

It is a super-2 number, since 2×11821338² = 279488064220488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11821331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 328353 + ... + 328388.

Almost surely, 2^11821338 is an apocalyptic number.

11821338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11821338 is an abundant number, since it is smaller than the sum of its proper divisors (13791600).

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

11821338 is a wasteful number, since it uses less digits than its factorization.

11821338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656749 (or 656746 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 11821338 is about 3438.2172706215. The cubic root of 11821338 is about 227.8009574049.

The spelling of 11821338 in words is "eleven million, eight hundred twenty-one thousand, three hundred thirty-eight".