6639434 has 8 divisors (see below), whose sum is σ = 10302660. Its totient is φ = 3205216.

The previous prime is 6639407. The next prime is 6639439. The reversal of 6639434 is 4349366.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6477025 + 162409 = 2545^2 + 403^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6639394 and 6639403.

It is not an unprimeable number, because it can be changed into a prime (6639439) 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, 57179 + ... + 57294.

Almost surely, 2^6639434 is an apocalyptic number.

6639434 is a deficient number, since it is larger than the sum of its proper divisors (3663226).

6639434 is a wasteful number, since it uses less digits than its factorization.

6639434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114504.

The product of its digits is 46656, while the sum is 35.

The square root of 6639434 is about 2576.7099177051. The cubic root of 6639434 is about 187.9505868325.

The spelling of 6639434 in words is "six million, six hundred thirty-nine thousand, four hundred thirty-four".