138169 has 4 divisors (see below), whose sum is σ = 138996. Its totient is φ = 137344.

The previous prime is 138163. The next prime is 138179. The reversal of 138169 is 961831.

138169 = T₃₀₂ + T₃₀₃ + T₃₀₄.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 55225 + 82944 = 235^2 + 288^2 .

It is a cyclic number.

It is not a de Polignac number, because 138169 - 2⁷ = 138041 is a prime.

It is a super-2 number, since 2×138169² = 38181345122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138163) 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, 64 + ... + 529.

It is an arithmetic number, because the mean of its divisors is an integer number (34749).

2¹³⁸¹⁶⁹ is an apocalyptic number.

138169 is the 304-th centered triangular number.

It is an amenable number.

138169 is a deficient number, since it is larger than the sum of its proper divisors (827).

138169 is an equidigital number, since it uses as much as digits as its factorization.

138169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826.

The product of its digits is 1296, while the sum is 28.

The square root of 138169 is about 371.7109091754. The cubic root of 138169 is about 51.6975789116.

The spelling of 138169 in words is "one hundred thirty-eight thousand, one hundred sixty-nine".