38581987392 has 280 divisors, whose sum is σ = 126503725656. Its totient is φ = 11549786112.

The previous prime is 38581987333. The next prime is 38581987393. The reversal of 38581987392 is 29378918583.

38581987392 is a `hidden beast` number, since 3 + 8 + 58 + 198 + 7 + 392 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5478368256 + 33103619136 = 74016^2 + 181944^2 .

It is a super-2 number, since 2×38581987392² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (38581987393) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2485768 + ... + 2501240.

Almost surely, 2^38581987392 is an apocalyptic number.

38581987392 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38581987392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63251862828).

38581987392 is an abundant number, since it is smaller than the sum of its proper divisors (87921738264).

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

38581987392 is a wasteful number, since it uses less digits than its factorization.

38581987392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15547 (or 15528 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

It can be divided in two parts, 3858198 and 7392, that added together give a triangular number (3865590 = T₂₇₈₀).

The spelling of 38581987392 in words is "thirty-eight billion, five hundred eighty-one million, nine hundred eighty-seven thousand, three hundred ninety-two".