11391643838 has 8 divisors (see below), whose sum is σ = 17986806120. Its totient is φ = 5396041800.

The previous prime is 11391643727. The next prime is 11391643859. The reversal of 11391643838 is 83834619311.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11391643792 and 11391643801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149890013 + ... + 149890088.

It is an arithmetic number, because the mean of its divisors is an integer number (2248350765).

Almost surely, 2^11391643838 is an apocalyptic number.

11391643838 is a deficient number, since it is larger than the sum of its proper divisors (6595162282).

11391643838 is a wasteful number, since it uses less digits than its factorization.

11391643838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299780122.

The product of its digits is 373248, while the sum is 47.

The spelling of 11391643838 in words is "eleven billion, three hundred ninety-one million, six hundred forty-three thousand, eight hundred thirty-eight".