26991239 has 8 divisors (see below), whose sum is σ = 29849232. Its totient is φ = 24200640.

The previous prime is 26991233. The next prime is 26991247. The reversal of 26991239 is 93219962.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26991239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26991196 and 26991205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26991233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16004 + ... + 17609.

It is an arithmetic number, because the mean of its divisors is an integer number (3731154).

Almost surely, 2^26991239 is an apocalyptic number.

26991239 is a deficient number, since it is larger than the sum of its proper divisors (2857993).

26991239 is a wasteful number, since it uses less digits than its factorization.

26991239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33697.

The product of its digits is 52488, while the sum is 41.

The square root of 26991239 is about 5195.3093266908. The cubic root of 26991239 is about 299.9675483416.

The spelling of 26991239 in words is "twenty-six million, nine hundred ninety-one thousand, two hundred thirty-nine".