11978239 has 32 divisors (see below), whose sum is σ = 15805440. Its totient is φ = 8819712.

The previous prime is 11978237. The next prime is 11978287. The reversal of 11978239 is 93287911.

It is a cyclic number.

It is not a de Polignac number, because 11978239 - 2¹ = 11978237 is a prime.

It is a super-2 number, since 2×11978239² = 286956419082242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123439 + ... + 123535.

It is an arithmetic number, because the mean of its divisors is an integer number (493920).

Almost surely, 2^11978239 is an apocalyptic number.

11978239 is a deficient number, since it is larger than the sum of its proper divisors (3827201).

11978239 is a wasteful number, since it uses less digits than its factorization.

11978239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199.

The product of its digits is 27216, while the sum is 40.

The square root of 11978239 is about 3460.9592600896. The cubic root of 11978239 is about 228.8043751812.

The spelling of 11978239 in words is "eleven million, nine hundred seventy-eight thousand, two hundred thirty-nine".