244865639 has 2 divisors, whose sum is σ = 244865640. Its totient is φ = 244865638.

The previous prime is 244865617. The next prime is 244865641. The reversal of 244865639 is 936568442.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-244865639 is a prime.

Together with 244865641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 244865593 and 244865602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (244865039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122432819 + 122432820.

It is an arithmetic number, because the mean of its divisors is an integer number (122432820).

Almost surely, 2^244865639 is an apocalyptic number.

244865639 is a deficient number, since it is larger than the sum of its proper divisors (1).

244865639 is an equidigital number, since it uses as much as digits as its factorization.

244865639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 47.

The square root of 244865639 is about 15648.1832491826. The cubic root of 244865639 is about 625.6180672006.

The spelling of 244865639 in words is "two hundred forty-four million, eight hundred sixty-five thousand, six hundred thirty-nine".