11689381 has 4 divisors (see below), whose sum is σ = 12752064. Its totient is φ = 10626700.

The previous prime is 11689357. The next prime is 11689409. The reversal of 11689381 is 18398611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11689381 - 2⁹ = 11688869 is a prime.

It is a super-2 number, since 2×11689381² = 273283256326322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11689381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11689481) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 531325 + ... + 531346.

It is an arithmetic number, because the mean of its divisors is an integer number (3188016).

Almost surely, 2^11689381 is an apocalyptic number.

11689381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11689381 is a deficient number, since it is larger than the sum of its proper divisors (1062683).

11689381 is a wasteful number, since it uses less digits than its factorization.

11689381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062682.

The product of its digits is 10368, while the sum is 37.

The square root of 11689381 is about 3418.9736764123. The cubic root of 11689381 is about 226.9501659836.

The spelling of 11689381 in words is "eleven million, six hundred eighty-nine thousand, three hundred eighty-one".