139438 has 16 divisors (see below), whose sum is σ = 233856. Its totient is φ = 61920.

The previous prime is 139429. The next prime is 139439. The reversal of 139438 is 834931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139439) 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 7 ways as a sum of consecutive naturals, for example, 720 + ... + 892.

It is an arithmetic number, because the mean of its divisors is an integer number (14616).

2¹³⁹⁴³⁸ is an apocalyptic number.

139438 is a deficient number, since it is larger than the sum of its proper divisors (94418).

139438 is a wasteful number, since it uses less digits than its factorization.

139438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219.

The product of its digits is 2592, while the sum is 28.

The square root of 139438 is about 373.4139793848. The cubic root of 139438 is about 51.8553673227.

The spelling of 139438 in words is "one hundred thirty-nine thousand, four hundred thirty-eight".