68398639 has 2 divisors, whose sum is σ = 68398640. Its totient is φ = 68398638.

The previous prime is 68398609. The next prime is 68398643. The reversal of 68398639 is 93689386.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68398639 - 2¹¹ = 68396591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68398609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34199319 + 34199320.

It is an arithmetic number, because the mean of its divisors is an integer number (34199320).

Almost surely, 2^68398639 is an apocalyptic number.

68398639 is a deficient number, since it is larger than the sum of its proper divisors (1).

68398639 is an equidigital number, since it uses as much as digits as its factorization.

68398639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 52.

The square root of 68398639 is about 8270.3469697468. The cubic root of 68398639 is about 408.9615580706.

The spelling of 68398639 in words is "sixty-eight million, three hundred ninety-eight thousand, six hundred thirty-nine".