38786533781 has 4 divisors (see below), whose sum is σ = 39186395052. Its totient is φ = 38386672512.

The previous prime is 38786533777. The next prime is 38786533817. The reversal of 38786533781 is 18733568783.

It is a happy number.

38786533781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23836580881 + 14949952900 = 154391^2 + 122270^2 .

It is a cyclic number.

It is not a de Polignac number, because 38786533781 - 2² = 38786533777 is a prime.

It is a super-2 number, since 2×38786533781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38786533781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38786533711) 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, 199930490 + ... + 199930683.

It is an arithmetic number, because the mean of its divisors is an integer number (9796598763).

Almost surely, 2^38786533781 is an apocalyptic number.

It is an amenable number.

38786533781 is a deficient number, since it is larger than the sum of its proper divisors (399861271).

38786533781 is an equidigital number, since it uses as much as digits as its factorization.

38786533781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399861270.

The product of its digits is 20321280, while the sum is 59.

The spelling of 38786533781 in words is "thirty-eight billion, seven hundred eighty-six million, five hundred thirty-three thousand, seven hundred eighty-one".