139508 has 6 divisors (see below), whose sum is σ = 244146. Its totient is φ = 69752.

The previous prime is 139501. The next prime is 139511. The reversal of 139508 is 805931.

It can be written as a sum of positive squares in only one way, i.e., 131044 + 8464 = 362^2 + 92^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139501) by changing a digit.

139508 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 17435 + ... + 17442.

It is an arithmetic number, because the mean of its divisors is an integer number (40691).

2¹³⁹⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

139508 is a deficient number, since it is larger than the sum of its proper divisors (104638).

139508 is a wasteful number, since it uses less digits than its factorization.

139508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34881 (or 34879 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 139508 is about 373.5076973772. The cubic root of 139508 is about 51.8640432659.

The spelling of 139508 in words is "one hundred thirty-nine thousand, five hundred eight".