138738 has 16 divisors (see below), whose sum is σ = 292320. Its totient is φ = 43776.

The previous prime is 138731. The next prime is 138739. The reversal of 138738 is 837831.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138738.

It is not an unprimeable number, because it can be changed into a prime (138731) by changing a digit.

138738 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495 + ... + 722.

It is an arithmetic number, because the mean of its divisors is an integer number (18270).

2¹³⁸⁷³⁸ is an apocalyptic number.

138738 is an abundant number, since it is smaller than the sum of its proper divisors (153582).

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

138738 is a wasteful number, since it uses less digits than its factorization.

138738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241.

The product of its digits is 4032, while the sum is 30.

The square root of 138738 is about 372.4755025502. The cubic root of 138738 is about 51.7684477626.

The spelling of 138738 in words is "one hundred thirty-eight thousand, seven hundred thirty-eight".