68388389 has 2 divisors, whose sum is σ = 68388390. Its totient is φ = 68388388.

The previous prime is 68388377. The next prime is 68388427. The reversal of 68388389 is 98388386.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63075364 + 5313025 = 7942^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 68388389 - 2⁴ = 68388373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68388389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68388349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34194194 + 34194195.

It is an arithmetic number, because the mean of its divisors is an integer number (34194195).

Almost surely, 2^68388389 is an apocalyptic number.

It is an amenable number.

68388389 is a deficient number, since it is larger than the sum of its proper divisors (1).

68388389 is an equidigital number, since it uses as much as digits as its factorization.

68388389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1990656, while the sum is 53.

The square root of 68388389 is about 8269.7272627336. The cubic root of 68388389 is about 408.9411284956.

The spelling of 68388389 in words is "sixty-eight million, three hundred eighty-eight thousand, three hundred eighty-nine".