11865891 has 8 divisors (see below), whose sum is σ = 15839824. Its totient is φ = 7901280.

The previous prime is 11865877. The next prime is 11865923. The reversal of 11865891 is 19856811.

11865891 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.

It is not a de Polignac number, because 11865891 - 2¹¹ = 11863843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11865871) 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, 1581 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (1979978).

Almost surely, 2^11865891 is an apocalyptic number.

11865891 is a deficient number, since it is larger than the sum of its proper divisors (3973933).

11865891 is a wasteful number, since it uses less digits than its factorization.

11865891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661.

The product of its digits is 17280, while the sum is 39.

The square root of 11865891 is about 3444.6902618378. The cubic root of 11865891 is about 228.0867821384.

The spelling of 11865891 in words is "eleven million, eight hundred sixty-five thousand, eight hundred ninety-one".