11961239 has 4 divisors (see below), whose sum is σ = 11968824. Its totient is φ = 11953656.

The previous prime is 11961223. The next prime is 11961259. The reversal of 11961239 is 93216911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11961239 - 2⁴ = 11961223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961259) 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 3 ways as a sum of consecutive naturals, for example, 437 + ... + 4910.

It is an arithmetic number, because the mean of its divisors is an integer number (2992206).

Almost surely, 2^11961239 is an apocalyptic number.

11961239 is a deficient number, since it is larger than the sum of its proper divisors (7585).

11961239 is an equidigital number, since it uses as much as digits as its factorization.

11961239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7584.

The product of its digits is 2916, while the sum is 32.

The square root of 11961239 is about 3458.5024215692. The cubic root of 11961239 is about 228.6960811335.

The spelling of 11961239 in words is "eleven million, nine hundred sixty-one thousand, two hundred thirty-nine".