11685638 has 4 divisors (see below), whose sum is σ = 17528460. Its totient is φ = 5842818.

The previous prime is 11685617. The next prime is 11685643. The reversal of 11685638 is 83658611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2921408 + ... + 2921411.

It is an arithmetic number, because the mean of its divisors is an integer number (4382115).

Almost surely, 2^11685638 is an apocalyptic number.

11685638 is a deficient number, since it is larger than the sum of its proper divisors (5842822).

11685638 is an equidigital number, since it uses as much as digits as its factorization.

11685638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5842821.

The product of its digits is 34560, while the sum is 38.

The square root of 11685638 is about 3418.4262460963. The cubic root of 11685638 is about 226.9259398603.

The spelling of 11685638 in words is "eleven million, six hundred eighty-five thousand, six hundred thirty-eight".