6434639 has 4 divisors (see below), whose sum is σ = 6642240. Its totient is φ = 6227040.

The previous prime is 6434627. The next prime is 6434647. The reversal of 6434639 is 9364346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9364346 = 2 ⋅4682173.

It is a cyclic number.

It is not a de Polignac number, because 6434639 - 2⁸ = 6434383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6434599 and 6434608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6434669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103754 + ... + 103815.

It is an arithmetic number, because the mean of its divisors is an integer number (1660560).

Almost surely, 2^6434639 is an apocalyptic number.

6434639 is a deficient number, since it is larger than the sum of its proper divisors (207601).

6434639 is a wasteful number, since it uses less digits than its factorization.

6434639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207600.

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

The square root of 6434639 is about 2536.6590232036. The cubic root of 6434639 is about 185.9979091760.

The spelling of 6434639 in words is "six million, four hundred thirty-four thousand, six hundred thirty-nine".