638523323 has 8 divisors (see below), whose sum is σ = 645801168. Its totient is φ = 631286784.

The previous prime is 638523317. The next prime is 638523359. The reversal of 638523323 is 323325836.

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 638523323 - 2⁴ = 638523307 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (638523923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21311 + ... + 41607.

It is an arithmetic number, because the mean of its divisors is an integer number (80725146).

Almost surely, 2^638523323 is an apocalyptic number.

638523323 is a deficient number, since it is larger than the sum of its proper divisors (7277845).

638523323 is a wasteful number, since it uses less digits than its factorization.

638523323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20653.

The product of its digits is 77760, while the sum is 35.

The square root of 638523323 is about 25269.0190351743. The cubic root of 638523323 is about 861.1105730706.

The spelling of 638523323 in words is "six hundred thirty-eight million, five hundred twenty-three thousand, three hundred twenty-three".