139538 has 8 divisors (see below), whose sum is σ = 239232. Its totient is φ = 59796.

The previous prime is 139537. The next prime is 139547. The reversal of 139538 is 835931.

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

It is a self number, because there is not a number n which added to its sum of digits gives 139538.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139538.

It is not an unprimeable number, because it can be changed into a prime (139537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4970 + ... + 4997.

It is an arithmetic number, because the mean of its divisors is an integer number (29904).

2¹³⁹⁵³⁸ is an apocalyptic number.

139538 is a deficient number, since it is larger than the sum of its proper divisors (99694).

139538 is an equidigital number, since it uses as much as digits as its factorization.

139538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9976.

The product of its digits is 3240, while the sum is 29.

The square root of 139538 is about 373.5478550333. The cubic root of 139538 is about 51.8677606388.

The spelling of 139538 in words is "one hundred thirty-nine thousand, five hundred thirty-eight".