6439139 has 8 divisors (see below), whose sum is σ = 7509600. Its totient is φ = 5518968.

The previous prime is 6439133. The next prime is 6439159. The reversal of 6439139 is 9319346.

It is not a de Polignac number, because 6439139 - 2⁴ = 6439123 is a prime.

It is a super-2 number, since 2×6439139² = 82925022122642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6439099 and 6439108.

It is not an unprimeable number, because it can be changed into a prime (6439133) 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, 9044 + ... + 9729.

It is an arithmetic number, because the mean of its divisors is an integer number (938700).

Almost surely, 2^6439139 is an apocalyptic number.

6439139 is a deficient number, since it is larger than the sum of its proper divisors (1070461).

6439139 is an equidigital number, since it uses as much as digits as its factorization.

6439139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18794 (or 18780 counting only the distinct ones).

The product of its digits is 17496, while the sum is 35.

The square root of 6439139 is about 2537.5458616545. The cubic root of 6439139 is about 186.0412576609.

The spelling of 6439139 in words is "six million, four hundred thirty-nine thousand, one hundred thirty-nine".