138434 has 8 divisors (see below), whose sum is σ = 218640. Its totient is φ = 65556.

The previous prime is 138433. The next prime is 138449. The reversal of 138434 is 434831.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784 + ... + 1859.

It is an arithmetic number, because the mean of its divisors is an integer number (27330).

2¹³⁸⁴³⁴ is an apocalyptic number.

138434 is a deficient number, since it is larger than the sum of its proper divisors (80206).

138434 is a wasteful number, since it uses less digits than its factorization.

138434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3664.

The product of its digits is 1152, while the sum is 23.

The square root of 138434 is about 372.0671982317. The cubic root of 138434 is about 51.7306087741.

The spelling of 138434 in words is "one hundred thirty-eight thousand, four hundred thirty-four".