638431343 has 8 divisors (see below), whose sum is σ = 698671440. Its totient is φ = 578558080.

The previous prime is 638431327. The next prime is 638431349. The reversal of 638431343 is 343134836.

638431343 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 638431343 - 2⁴ = 638431327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638431349) 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, 88058 + ... + 95031.

It is an arithmetic number, because the mean of its divisors is an integer number (87333930).

Almost surely, 2^638431343 is an apocalyptic number.

638431343 is a deficient number, since it is larger than the sum of its proper divisors (60240097).

638431343 is a wasteful number, since it uses less digits than its factorization.

638431343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183417.

The product of its digits is 62208, while the sum is 35.

The square root of 638431343 is about 25267.1989543756. The cubic root of 638431343 is about 861.0692231041.

The spelling of 638431343 in words is "six hundred thirty-eight million, four hundred thirty-one thousand, three hundred forty-three".