638873341 has 4 divisors (see below), whose sum is σ = 648408832. Its totient is φ = 629337852.

The previous prime is 638873321. The next prime is 638873359. The reversal of 638873341 is 143378836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638873341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638873321) 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 3 ways as a sum of consecutive naturals, for example, 4767645 + ... + 4767778.

It is an arithmetic number, because the mean of its divisors is an integer number (162102208).

Almost surely, 2^638873341 is an apocalyptic number.

It is an amenable number.

638873341 is a deficient number, since it is larger than the sum of its proper divisors (9535491).

638873341 is an equidigital number, since it uses as much as digits as its factorization.

638873341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9535490.

The product of its digits is 290304, while the sum is 43.

The square root of 638873341 is about 25275.9439190706. The cubic root of 638873341 is about 861.2678887254.

The spelling of 638873341 in words is "six hundred thirty-eight million, eight hundred seventy-three thousand, three hundred forty-one".