638600823 has 12 divisors (see below), whose sum is σ = 1054198288. Its totient is φ = 364914720.

The previous prime is 638600821. The next prime is 638600827. The reversal of 638600823 is 328006836.

It is not a de Polignac number, because 638600823 - 2¹ = 638600821 is a prime.

It is a super-2 number, since 2×638600823² = 815622022272554658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638600821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5068198 + ... + 5068323.

Almost surely, 2^638600823 is an apocalyptic number.

638600823 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

638600823 is a deficient number, since it is larger than the sum of its proper divisors (415597465).

638600823 is a wasteful number, since it uses less digits than its factorization.

638600823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10136534 (or 10136531 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 638600823 is about 25270.5524870352. The cubic root of 638600823 is about 861.1454104144.

The spelling of 638600823 in words is "six hundred thirty-eight million, six hundred thousand, eight hundred twenty-three".