38780038981 has 4 divisors (see below), whose sum is σ = 38786303052. Its totient is φ = 38773774912.

The previous prime is 38780038963. The next prime is 38780038987. The reversal of 38780038981 is 18983008783.

38780038981 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 18869417956 + 19910621025 = 137366^2 + 141105^2 .

It is a cyclic number.

It is not a de Polignac number, because 38780038981 - 2¹⁹ = 38779514693 is a prime.

It is a super-2 number, since 2×38780038981² (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 (38780038987) 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, 3122740 + ... + 3135133.

It is an arithmetic number, because the mean of its divisors is an integer number (9696575763).

Almost surely, 2^38780038981 is an apocalyptic number.

It is an amenable number.

38780038981 is a deficient number, since it is larger than the sum of its proper divisors (6264071).

38780038981 is an equidigital number, since it uses as much as digits as its factorization.

38780038981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6264070.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 38780038981 in words is "thirty-eight billion, seven hundred eighty million, thirty-eight thousand, nine hundred eighty-one".