38138481836 has 144 divisors (see below), whose sum is σ = 89783733312. Its totient is φ = 13999104000.

The previous prime is 38138481833. The next prime is 38138481839. The reversal of 38138481836 is 63818483183.

It is an interprime number because it is at equal distance from previous prime (38138481833) and next prime (38138481839).

It is not an unprimeable number, because it can be changed into a prime (38138481833) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3069236 + ... + 3081636.

It is an arithmetic number, because the mean of its divisors is an integer number (623498148).

Almost surely, 2^38138481836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38138481836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44891866656).

38138481836 is an abundant number, since it is smaller than the sum of its proper divisors (51645251476).

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

38138481836 is a wasteful number, since it uses less digits than its factorization.

38138481836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12520 (or 12511 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 53.

The spelling of 38138481836 in words is "thirty-eight billion, one hundred thirty-eight million, four hundred eighty-one thousand, eight hundred thirty-six".