11971439 has 2 divisors, whose sum is σ = 11971440. Its totient is φ = 11971438.

The previous prime is 11971411. The next prime is 11971447. The reversal of 11971439 is 93417911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11971439 - 2¹⁶ = 11905903 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11971399 and 11971408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11971409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5985719 + 5985720.

It is an arithmetic number, because the mean of its divisors is an integer number (5985720).

Almost surely, 2^11971439 is an apocalyptic number.

11971439 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971439 is an equidigital number, since it uses as much as digits as its factorization.

11971439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 11971439 is about 3459.9767340258. The cubic root of 11971439 is about 228.7610698655.

The spelling of 11971439 in words is "eleven million, nine hundred seventy-one thousand, four hundred thirty-nine".