11809639 has 4 divisors (see below), whose sum is σ = 11820424. Its totient is φ = 11798856.

The previous prime is 11809613. The next prime is 11809663. The reversal of 11809639 is 93690811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11809639 - 2¹¹ = 11807591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11809598 and 11809607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11809669) 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, 3537 + ... + 6010.

It is an arithmetic number, because the mean of its divisors is an integer number (2955106).

Almost surely, 2^11809639 is an apocalyptic number.

11809639 is a deficient number, since it is larger than the sum of its proper divisors (10785).

11809639 is an equidigital number, since it uses as much as digits as its factorization.

11809639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10784.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 11809639 is about 3436.5155317560. The cubic root of 11809639 is about 227.7257847795.

The spelling of 11809639 in words is "eleven million, eight hundred nine thousand, six hundred thirty-nine".