11969891 has 8 divisors (see below), whose sum is σ = 12247200. Its totient is φ = 11694592.

The previous prime is 11969879. The next prime is 11969911. The reversal of 11969891 is 19896911.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11969891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11969801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23546 + ... + 24048.

It is an arithmetic number, because the mean of its divisors is an integer number (1530900).

Almost surely, 2^11969891 is an apocalyptic number.

11969891 is a deficient number, since it is larger than the sum of its proper divisors (277309).

11969891 is an equidigital number, since it uses as much as digits as its factorization.

11969891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005.

The product of its digits is 34992, while the sum is 44.

The square root of 11969891 is about 3459.7530258676. The cubic root of 11969891 is about 228.7512092464.

The spelling of 11969891 in words is "eleven million, nine hundred sixty-nine thousand, eight hundred ninety-one".