638211023 has 8 divisors (see below), whose sum is σ = 650097360. Its totient is φ = 626434560.

The previous prime is 638211019. The next prime is 638211089. The reversal of 638211023 is 320112836.

638211023 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 638211023 - 2² = 638211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638210983 and 638211001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638211523) 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, 15698 + ... + 39023.

It is an arithmetic number, because the mean of its divisors is an integer number (81262170).

Almost surely, 2^638211023 is an apocalyptic number.

638211023 is a deficient number, since it is larger than the sum of its proper divisors (11886337).

638211023 is a wasteful number, since it uses less digits than its factorization.

638211023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54937.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 638211023 is about 25262.8387755612. The cubic root of 638211023 is about 860.9701612393.

Adding to 638211023 its reverse (320112836), we get a palindrome (958323859).

The spelling of 638211023 in words is "six hundred thirty-eight million, two hundred eleven thousand, twenty-three".