38390724138 has 32 divisors (see below), whose sum is σ = 82698158592. Its totient is φ = 11811038400.

The previous prime is 38390724133. The next prime is 38390724157. The reversal of 38390724138 is 83142709383.

It is not an unprimeable number, because it can be changed into a prime (38390724133) 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 15 ways as a sum of consecutive naturals, for example, 699828 + ... + 752688.

It is an arithmetic number, because the mean of its divisors is an integer number (2584317456).

Almost surely, 2^38390724138 is an apocalyptic number.

38390724138 is an abundant number, since it is smaller than the sum of its proper divisors (44307434454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38390724138 is a wasteful number, since it uses less digits than its factorization.

38390724138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62190.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 38390724138 in words is "thirty-eight billion, three hundred ninety million, seven hundred twenty-four thousand, one hundred thirty-eight".