68838391 has 4 divisors (see below), whose sum is σ = 68858032. Its totient is φ = 68818752.

The previous prime is 68838359. The next prime is 68838421. The reversal of 68838391 is 19383886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19383886 = 2 ⋅9691943.

It is a cyclic number.

It is not a de Polignac number, because 68838391 - 2⁵ = 68838359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68838331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2970 + ... + 12103.

It is an arithmetic number, because the mean of its divisors is an integer number (17214508).

Almost surely, 2^68838391 is an apocalyptic number.

68838391 is a deficient number, since it is larger than the sum of its proper divisors (19641).

68838391 is a wasteful number, since it uses less digits than its factorization.

68838391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19640.

The product of its digits is 248832, while the sum is 46.

The square root of 68838391 is about 8296.8904416052. The cubic root of 68838391 is about 409.8361252684.

The spelling of 68838391 in words is "sixty-eight million, eight hundred thirty-eight thousand, three hundred ninety-one".