139086439 has 4 divisors (see below), whose sum is σ = 141162424. Its totient is φ = 137010456.

The previous prime is 139086421. The next prime is 139086509. The reversal of 139086439 is 934680931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934680931 = 373 ⋅2505847.

It is a cyclic number.

It is not a de Polignac number, because 139086439 - 2¹¹ = 139084391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139086395 and 139086404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139086139) 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, 1037892 + ... + 1038025.

It is an arithmetic number, because the mean of its divisors is an integer number (35290606).

Almost surely, 2^139086439 is an apocalyptic number.

139086439 is a deficient number, since it is larger than the sum of its proper divisors (2075985).

139086439 is an equidigital number, since it uses as much as digits as its factorization.

139086439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075984.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 139086439 is about 11793.4913829620. The cubic root of 139086439 is about 518.1175016558.

The spelling of 139086439 in words is "one hundred thirty-nine million, eighty-six thousand, four hundred thirty-nine".