11728381 has 8 divisors (see below), whose sum is σ = 13426560. Its totient is φ = 10035888.

The previous prime is 11728373. The next prime is 11728391. The reversal of 11728381 is 18382711.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11728381 - 2³ = 11728373 is a prime.

It is a super-2 number, since 2×11728381² = 275109841762322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11728391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4875 + ... + 6871.

It is an arithmetic number, because the mean of its divisors is an integer number (1678320).

Almost surely, 2^11728381 is an apocalyptic number.

It is an amenable number.

11728381 is a deficient number, since it is larger than the sum of its proper divisors (1698179).

11728381 is an equidigital number, since it uses as much as digits as its factorization.

11728381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843.

The product of its digits is 2688, while the sum is 31.

The square root of 11728381 is about 3424.6723930911. The cubic root of 11728381 is about 227.2022817354.

The spelling of 11728381 in words is "eleven million, seven hundred twenty-eight thousand, three hundred eighty-one".