38721344873506 has 8 divisors (see below), whose sum is σ = 58093849066140. Its totient is φ = 19356728518128.

The previous prime is 38721344873473. The next prime is 38721344873507. The reversal of 38721344873506 is 60537844312783.

It can be written as a sum of positive squares in 2 ways, for example, as 36722206213225 + 1999138660281 = 6059885^2 + 1413909^2 .

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 (38721344873507) 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, 1971947041 + ... + 1971966676.

Almost surely, 2^{38721344873506} is an apocalyptic number.

38721344873506 is a deficient number, since it is larger than the sum of its proper divisors (19372504192634).

38721344873506 is a wasteful number, since it uses less digits than its factorization.

38721344873506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3943918628.

The product of its (nonzero) digits is 81285120, while the sum is 61.

The spelling of 38721344873506 in words is "thirty-eight trillion, seven hundred twenty-one billion, three hundred forty-four million, eight hundred seventy-three thousand, five hundred six".