638498122 has 8 divisors (see below), whose sum is σ = 983632356. Its totient is φ = 310620672.

The previous prime is 638498117. The next prime is 638498123. The reversal of 638498122 is 221894836.

It can be written as a sum of positive squares in 2 ways, for example, as 637108081 + 1390041 = 25241^2 + 1179^2 .

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

It is not an unprimeable number, because it can be changed into a prime (638498123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4314103 + ... + 4314250.

Almost surely, 2^638498122 is an apocalyptic number.

638498122 is a deficient number, since it is larger than the sum of its proper divisors (345134234).

638498122 is a wasteful number, since it uses less digits than its factorization.

638498122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8628392.

The product of its digits is 165888, while the sum is 43.

The square root of 638498122 is about 25268.5203761518. The cubic root of 638498122 is about 861.0992442581.

The spelling of 638498122 in words is "six hundred thirty-eight million, four hundred ninety-eight thousand, one hundred twenty-two".