11909538 has 64 divisors (see below), whose sum is σ = 28385280. Its totient is φ = 3692304.

The previous prime is 11909519. The next prime is 11909543. The reversal of 11909538 is 83590911.

It is a happy number.

11909538 is a `hidden beast` number, since 119 + 0 + 9 + 538 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53295 + ... + 53517.

It is an arithmetic number, because the mean of its divisors is an integer number (443520).

Almost surely, 2^11909538 is an apocalyptic number.

11909538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11909538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14192640).

11909538 is an abundant number, since it is smaller than the sum of its proper divisors (16475742).

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

11909538 is a wasteful number, since it uses less digits than its factorization.

11909538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 11909538 is about 3451.0198492620. The cubic root of 11909538 is about 228.3661015836.

The spelling of 11909538 in words is "eleven million, nine hundred nine thousand, five hundred thirty-eight".