38749649839 has 4 divisors (see below), whose sum is σ = 41029041024. Its totient is φ = 36470258656.

The previous prime is 38749649791. The next prime is 38749649843. The reversal of 38749649839 is 93894694783.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38749649839 - 2²¹ = 38747552687 is a prime.

It is a super-2 number, since 2×38749649839² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38749649039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139695567 + ... + 1139695600.

It is an arithmetic number, because the mean of its divisors is an integer number (10257260256).

Almost surely, 2^38749649839 is an apocalyptic number.

38749649839 is a deficient number, since it is larger than the sum of its proper divisors (2279391185).

38749649839 is a wasteful number, since it uses less digits than its factorization.

38749649839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279391184.

The product of its digits is 282175488, while the sum is 70.

The spelling of 38749649839 in words is "thirty-eight billion, seven hundred forty-nine million, six hundred forty-nine thousand, eight hundred thirty-nine".