139389 has 8 divisors (see below), whose sum is σ = 188160. Its totient is φ = 91776.

The previous prime is 139387. The next prime is 139393. The reversal of 139389 is 983931.

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

It is not a de Polignac number, because 139389 - 2¹ = 139387 is a prime.

139389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52 + ... + 530.

It is an arithmetic number, because the mean of its divisors is an integer number (23520).

2¹³⁹³⁸⁹ is an apocalyptic number.

It is an amenable number.

139389 is a deficient number, since it is larger than the sum of its proper divisors (48771).

139389 is an equidigital number, since it uses as much as digits as its factorization.

139389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579.

The product of its digits is 5832, while the sum is 33.

The square root of 139389 is about 373.3483627927. The cubic root of 139389 is about 51.8492924348.

It can be divided in two parts, 139 and 389, that added together give a triangular number (528 = T₃₂).

The spelling of 139389 in words is "one hundred thirty-nine thousand, three hundred eighty-nine".