638434543 has 8 divisors (see below), whose sum is σ = 643659408. Its totient is φ = 633229824.

The previous prime is 638434481. The next prime is 638434571. The reversal of 638434543 is 345434836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638434543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638434496 and 638434505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638435543) 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, 62205 + ... + 71737.

It is an arithmetic number, because the mean of its divisors is an integer number (80457426).

Almost surely, 2^638434543 is an apocalyptic number.

638434543 is a deficient number, since it is larger than the sum of its proper divisors (5224865).

638434543 is a wasteful number, since it uses less digits than its factorization.

638434543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10073.

The product of its digits is 414720, while the sum is 40.

The square root of 638434543 is about 25267.2622775005. The cubic root of 638434543 is about 861.0706617433.

It can be divided in two parts, 63843 and 4543, that added together give a palindrome (68386).

The spelling of 638434543 in words is "six hundred thirty-eight million, four hundred thirty-four thousand, five hundred forty-three".