11815638 has 8 divisors (see below), whose sum is σ = 23631288. Its totient is φ = 3938544.

The previous prime is 11815633. The next prime is 11815649. The reversal of 11815638 is 83651811.

11815638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

11815638 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11815599 and 11815608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11815633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984631 + ... + 984642.

It is an arithmetic number, because the mean of its divisors is an integer number (2953911).

Almost surely, 2^11815638 is an apocalyptic number.

11815638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

11815638 is a wasteful number, since it uses less digits than its factorization.

11815638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969278.

The product of its digits is 5760, while the sum is 33.

The square root of 11815638 is about 3437.3882527291. The cubic root of 11815638 is about 227.7643379119.

The spelling of 11815638 in words is "eleven million, eight hundred fifteen thousand, six hundred thirty-eight".