11861643 has 8 divisors (see below), whose sum is σ = 16648000. Its totient is φ = 7491528.

The previous prime is 11861639. The next prime is 11861659. The reversal of 11861643 is 34616811.

11861643 is digitally balanced in base 3, 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.

It is not a de Polignac number, because 11861643 - 2² = 11861639 is a prime.

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 11861643.

It is not an unprimeable number, because it can be changed into a prime (11861683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103993 + ... + 104106.

It is an arithmetic number, because the mean of its divisors is an integer number (2081000).

Almost surely, 2^11861643 is an apocalyptic number.

11861643 is a deficient number, since it is larger than the sum of its proper divisors (4786357).

11861643 is a wasteful number, since it uses less digits than its factorization.

11861643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208121.

The product of its digits is 3456, while the sum is 30.

The square root of 11861643 is about 3444.0736054852. The cubic root of 11861643 is about 228.0595604631.

The spelling of 11861643 in words is "eleven million, eight hundred sixty-one thousand, six hundred forty-three".