13940239 has 2 divisors, whose sum is σ = 13940240. Its totient is φ = 13940238.

The previous prime is 13940237. The next prime is 13940257. The reversal of 13940239 is 93204931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13940239 - 2¹ = 13940237 is a prime.

Together with 13940237, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13940239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13940237) 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 as a sum of consecutive naturals, namely, 6970119 + 6970120.

It is an arithmetic number, because the mean of its divisors is an integer number (6970120).

Almost surely, 2^13940239 is an apocalyptic number.

13940239 is a deficient number, since it is larger than the sum of its proper divisors (1).

13940239 is an equidigital number, since it uses as much as digits as its factorization.

13940239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 13940239 is about 3733.6629467589. The cubic root of 13940239 is about 240.6708027500.

The spelling of 13940239 in words is "thirteen million, nine hundred forty thousand, two hundred thirty-nine".