139385 has 8 divisors (see below), whose sum is σ = 170376. Its totient is φ = 109440.

The previous prime is 139369. The next prime is 139387. The reversal of 139385 is 583931.

It can be written as a sum of positive squares in 4 ways, for example, as 6889 + 132496 = 83^2 + 364^2 .

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

It is not a de Polignac number, because 139385 - 2⁴ = 139369 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139385.

It is not an unprimeable number, because it can be changed into a prime (139387) 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, 77 + ... + 533.

It is an arithmetic number, because the mean of its divisors is an integer number (21297).

2¹³⁹³⁸⁵ is an apocalyptic number.

139385 is the 305-th pentagonal number.

It is an amenable number.

139385 is a deficient number, since it is larger than the sum of its proper divisors (30991).

139385 is an equidigital number, since it uses as much as digits as its factorization.

139385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523.

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

The square root of 139385 is about 373.3430058271. The cubic root of 139385 is about 51.8487964627.

The spelling of 139385 in words is "one hundred thirty-nine thousand, three hundred eighty-five".