638452385 has 8 divisors (see below), whose sum is σ = 769196736. Its totient is φ = 508726000.

The previous prime is 638452361. The next prime is 638452439. The reversal of 638452385 is 583254836.

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

It is not a de Polignac number, because 638452385 - 2¹² = 638448289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253109 + ... + 255618.

It is an arithmetic number, because the mean of its divisors is an integer number (96149592).

Almost surely, 2^638452385 is an apocalyptic number.

It is an amenable number.

638452385 is a deficient number, since it is larger than the sum of its proper divisors (130744351).

638452385 is a wasteful number, since it uses less digits than its factorization.

638452385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508983.

The product of its digits is 691200, while the sum is 44.

The square root of 638452385 is about 25267.6153405896. The cubic root of 638452385 is about 861.0786829674.

The spelling of 638452385 in words is "six hundred thirty-eight million, four hundred fifty-two thousand, three hundred eighty-five".