638403334 has 4 divisors (see below), whose sum is σ = 957605004. Its totient is φ = 319201666.

The previous prime is 638403257. The next prime is 638403371. The reversal of 638403334 is 433304836.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 638403334.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159600832 + ... + 159600835.

It is an arithmetic number, because the mean of its divisors is an integer number (239401251).

Almost surely, 2^638403334 is an apocalyptic number.

638403334 is a deficient number, since it is larger than the sum of its proper divisors (319201670).

638403334 is a wasteful number, since it uses less digits than its factorization.

638403334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319201669.

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 638403334 is about 25266.6446921628. The cubic root of 638403334 is about 861.0566307605.

The spelling of 638403334 in words is "six hundred thirty-eight million, four hundred three thousand, three hundred thirty-four".