138069 has 18 divisors (see below), whose sum is σ = 215670. Its totient is φ = 85008.

The previous prime is 138059. The next prime is 138071. The reversal of 138069 is 960831.

138069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 119025 + 19044 = 345^2 + 138^2 .

It is not a de Polignac number, because 138069 - 2⁴ = 138053 is a prime.

It is a super-2 number, since 2×138069² = 38126097522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138059) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4747 + ... + 4775.

2¹³⁸⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

138069 is a deficient number, since it is larger than the sum of its proper divisors (77601).

138069 is a wasteful number, since it uses less digits than its factorization.

138069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 138069 is about 371.5763716923. The cubic root of 138069 is about 51.6851038373.

The spelling of 138069 in words is "one hundred thirty-eight thousand, sixty-nine".