139647 has 4 divisors (see below), whose sum is σ = 186200. Its totient is φ = 93096.

The previous prime is 139627. The next prime is 139661. The reversal of 139647 is 746931.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-139647 is a prime.

It is a D-number.

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 139647.

It is not an unprimeable number, because it can be changed into a prime (139627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23272 + ... + 23277.

It is an arithmetic number, because the mean of its divisors is an integer number (46550).

2¹³⁹⁶⁴⁷ is an apocalyptic number.

139647 is a deficient number, since it is larger than the sum of its proper divisors (46553).

139647 is an equidigital number, since it uses as much as digits as its factorization.

139647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46552.

The product of its digits is 4536, while the sum is 30.

The square root of 139647 is about 373.6937248603. The cubic root of 139647 is about 51.8812626106.

The spelling of 139647 in words is "one hundred thirty-nine thousand, six hundred forty-seven".