11959891 has 8 divisors (see below), whose sum is σ = 12958704. Its totient is φ = 10993920.

The previous prime is 11959867. The next prime is 11959897. The reversal of 11959891 is 19895911.

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

It is a cyclic number.

It is not a de Polignac number, because 11959891 - 2⁵ = 11959859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11959897) 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, 7450 + ... + 8911.

It is an arithmetic number, because the mean of its divisors is an integer number (1619838).

Almost surely, 2^11959891 is an apocalyptic number.

11959891 is a deficient number, since it is larger than the sum of its proper divisors (998813).

11959891 is a wasteful number, since it uses less digits than its factorization.

11959891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16421.

The product of its digits is 29160, while the sum is 43.

The square root of 11959891 is about 3458.3075340403. The cubic root of 11959891 is about 228.6874896629.

The spelling of 11959891 in words is "eleven million, nine hundred fifty-nine thousand, eight hundred ninety-one".