8639398538 has 8 divisors (see below), whose sum is σ = 13721397732. Its totient is φ = 4065599296.

The previous prime is 8639398531. The next prime is 8639398561. The reversal of 8639398538 is 8358939368.

It can be written as a sum of positive squares in 2 ways, for example, as 6777734929 + 1861663609 = 82327^2 + 43147^2 .

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 (8639398531) 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 3 ways as a sum of consecutive naturals, for example, 127049945 + ... + 127050012.

Almost surely, 2^8639398538 is an apocalyptic number.

8639398538 is a deficient number, since it is larger than the sum of its proper divisors (5081999194).

8639398538 is a wasteful number, since it uses less digits than its factorization.

8639398538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254099976.

The product of its digits is 33592320, while the sum is 62.

The square root of 8639398538 is about 92948.3649022402. The cubic root of 8639398538 is about 2051.9235198352.

The spelling of 8639398538 in words is "eight billion, six hundred thirty-nine million, three hundred ninety-eight thousand, five hundred thirty-eight".