138717798 has 8 divisors (see below), whose sum is σ = 277435608. Its totient is φ = 46239264.

The previous prime is 138717779. The next prime is 138717833. The reversal of 138717798 is 897717831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

138717798 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 138717798.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11559811 + ... + 11559822.

It is an arithmetic number, because the mean of its divisors is an integer number (34679451).

Almost surely, 2^138717798 is an apocalyptic number.

138717798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138717798 is a wasteful number, since it uses less digits than its factorization.

138717798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23119638.

The product of its digits is 592704, while the sum is 51.

The square root of 138717798 is about 11777.8520112965. The cubic root of 138717798 is about 517.6593492803.

The spelling of 138717798 in words is "one hundred thirty-eight million, seven hundred seventeen thousand, seven hundred ninety-eight".