11967391 has 4 divisors (see below), whose sum is σ = 12290872. Its totient is φ = 11643912.

The previous prime is 11967379. The next prime is 11967409. The reversal of 11967391 is 19376911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11967391 - 2¹⁵ = 11934623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 323443 = 11967391 / (1 + 1 + 9 + 6 + 7 + 3 + 9 + 1).

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 11967391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11967301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161685 + ... + 161758.

It is an arithmetic number, because the mean of its divisors is an integer number (3072718).

Almost surely, 2^11967391 is an apocalyptic number.

11967391 is a deficient number, since it is larger than the sum of its proper divisors (323481).

11967391 is an equidigital number, since it uses as much as digits as its factorization.

11967391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323480.

The product of its digits is 10206, while the sum is 37.

The square root of 11967391 is about 3459.3917095351. The cubic root of 11967391 is about 228.7352826786.

The spelling of 11967391 in words is "eleven million, nine hundred sixty-seven thousand, three hundred ninety-one".