11971239 has 48 divisors (see below), whose sum is σ = 19961856. Its totient is φ = 6350400.

The previous prime is 11971231. The next prime is 11971241. The reversal of 11971239 is 93217911.

It is not a de Polignac number, because 11971239 - 2³ = 11971231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11971231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 168574 + ... + 168644.

It is an arithmetic number, because the mean of its divisors is an integer number (415872).

Almost surely, 2^11971239 is an apocalyptic number.

11971239 is a deficient number, since it is larger than the sum of its proper divisors (7990617).

11971239 is a wasteful number, since it uses less digits than its factorization.

11971239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 149 counting only the distinct ones).

The product of its digits is 3402, while the sum is 33.

The square root of 11971239 is about 3459.9478319767. The cubic root of 11971239 is about 228.7597959315.

The spelling of 11971239 in words is "eleven million, nine hundred seventy-one thousand, two hundred thirty-nine".