139285 has 8 divisors (see below), whose sum is σ = 169560. Its totient is φ = 109824.

The previous prime is 139273. The next prime is 139291. The reversal of 139285 is 582931.

It can be written as a sum of positive squares in 4 ways, for example, as 5329 + 133956 = 73^2 + 366^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139285 is a prime.

It is a super-2 number, since 2×139285² = 38800622450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 289 + ... + 601.

It is an arithmetic number, because the mean of its divisors is an integer number (21195).

2¹³⁹²⁸⁵ is an apocalyptic number.

It is an amenable number.

139285 is a deficient number, since it is larger than the sum of its proper divisors (30275).

139285 is an equidigital number, since it uses as much as digits as its factorization.

139285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407.

The product of its digits is 2160, while the sum is 28.

The square root of 139285 is about 373.2090566961. The cubic root of 139285 is about 51.8363940758.

It can be divided in two parts, 139 and 285, that added together give a palindrome (424).

The spelling of 139285 in words is "one hundred thirty-nine thousand, two hundred eighty-five".