139239 has 14 divisors (see below), whose sum is σ = 209856. Its totient is φ = 92340.

The previous prime is 139201. The next prime is 139241. The reversal of 139239 is 932931.

It is not a de Polignac number, because 139239 - 2⁹ = 138727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139339) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 634 + ... + 824.

139239 is a Friedman number, since it can be written as 9^3*(193-2), using all its digits and the basic arithmetic operations.

2¹³⁹²³⁹ is an apocalyptic number.

139239 is a deficient number, since it is larger than the sum of its proper divisors (70617).

139239 is an frugal number, since it uses more digits than its factorization.

139239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 194 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 139239 is about 373.1474239493. The cubic root of 139239 is about 51.8306869844.

It can be divided in two parts, 1392 and 39, that added together give a triangular number (1431 = T₅₃).

The spelling of 139239 in words is "one hundred thirty-nine thousand, two hundred thirty-nine".