6939439 has 16 divisors (see below), whose sum is σ = 7862400. Its totient is φ = 6080256.

The previous prime is 6939437. The next prime is 6939467. The reversal of 6939439 is 9349396.

It is a happy number.

It is not a de Polignac number, because 6939439 - 2¹ = 6939437 is a prime.

6939439 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6939395 and 6939404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6939437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29667 + ... + 29899.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^6939439 is an apocalyptic number.

6939439 is a deficient number, since it is larger than the sum of its proper divisors (922961).

6939439 is a wasteful number, since it uses less digits than its factorization.

6939439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354.

The product of its digits is 157464, while the sum is 43.

The square root of 6939439 is about 2634.2814959681. The cubic root of 6939439 is about 190.7398576462.

Subtracting from 6939439 its sum of digits (43), we obtain a palindrome (6939396).

The spelling of 6939439 in words is "six million, nine hundred thirty-nine thousand, four hundred thirty-nine".