13889789 has 2 divisors, whose sum is σ = 13889790. Its totient is φ = 13889788.

The previous prime is 13889749. The next prime is 13889797. The reversal of 13889789 is 98798831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8791225 + 5098564 = 2965^2 + 2258^2 .

It is an emirp because it is prime and its reverse (98798831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13889789 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13889789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13889749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6944894 + 6944895.

It is an arithmetic number, because the mean of its divisors is an integer number (6944895).

Almost surely, 2^13889789 is an apocalyptic number.

It is an amenable number.

13889789 is a deficient number, since it is larger than the sum of its proper divisors (1).

13889789 is an equidigital number, since it uses as much as digits as its factorization.

13889789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 53.

The square root of 13889789 is about 3726.9007231210. The cubic root of 13889789 is about 240.3801210118.

The spelling of 13889789 in words is "thirteen million, eight hundred eighty-nine thousand, seven hundred eighty-nine".