138659768 has 24 divisors (see below), whose sum is σ = 281527200. Its totient is φ = 63996192.

The previous prime is 138659767. The next prime is 138659779. The reversal of 138659768 is 867956831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138659761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49928 + ... + 52631.

It is an arithmetic number, because the mean of its divisors is an integer number (11730300).

Almost surely, 2^138659768 is an apocalyptic number.

It is an amenable number.

138659768 is an abundant number, since it is smaller than the sum of its proper divisors (142867432).

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

138659768 is a wasteful number, since it uses less digits than its factorization.

138659768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102591 (or 102574 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 53.

The square root of 138659768 is about 11775.3882313918. The cubic root of 138659768 is about 517.5871548387.

The spelling of 138659768 in words is "one hundred thirty-eight million, six hundred fifty-nine thousand, seven hundred sixty-eight".