139247 has 4 divisors (see below), whose sum is σ = 147456. Its totient is φ = 131040.

The previous prime is 139241. The next prime is 139267. The reversal of 139247 is 742931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139247 - 2¹² = 135151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139247.

It is not an unprimeable number, because it can be changed into a prime (139241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4079 + ... + 4112.

It is an arithmetic number, because the mean of its divisors is an integer number (36864).

2¹³⁹²⁴⁷ is an apocalyptic number.

139247 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

139247 is a deficient number, since it is larger than the sum of its proper divisors (8209).

139247 is an equidigital number, since it uses as much as digits as its factorization.

139247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8208.

The product of its digits is 1512, while the sum is 26.

The square root of 139247 is about 373.1581434191. The cubic root of 139247 is about 51.8316796123.

It can be divided in two parts, 13924 and 7, that added together give a palindrome (13931).

The spelling of 139247 in words is "one hundred thirty-nine thousand, two hundred forty-seven".