139009 has 12 divisors (see below), whose sum is σ = 163324. Its totient is φ = 117504.

The previous prime is 138977. The next prime is 139021. The reversal of 139009 is 900931.

It can be written as a sum of positive squares in 6 ways, for example, as 14400 + 124609 = 120^2 + 353^2 .

It is not a de Polignac number, because 139009 - 2⁵ = 138977 is a prime.

It is a super-3 number, since 3×139009³ = 8058422102333187, which contains 333 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3739 + ... + 3775.

2¹³⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

139009 is a deficient number, since it is larger than the sum of its proper divisors (24315).

139009 is a wasteful number, since it uses less digits than its factorization.

139009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 139009 is about 372.8391073908. The cubic root of 139009 is about 51.8021326572.

The spelling of 139009 in words is "one hundred thirty-nine thousand, nine".