38806477981 has 4 divisors (see below), whose sum is σ = 38814372000. Its totient is φ = 38798583964.

The previous prime is 38806477943. The next prime is 38806477991. The reversal of 38806477981 is 18977460883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18977460883 = 347 ⋅54690089.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38806477981 is a prime.

It is a super-2 number, since 2×38806477981² (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 (38806477991) 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 3 ways as a sum of consecutive naturals, for example, 3939631 + ... + 3949468.

It is an arithmetic number, because the mean of its divisors is an integer number (9703593000).

Almost surely, 2^38806477981 is an apocalyptic number.

It is an amenable number.

38806477981 is a deficient number, since it is larger than the sum of its proper divisors (7894019).

38806477981 is an equidigital number, since it uses as much as digits as its factorization.

38806477981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7894018.

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 38806477981 in words is "thirty-eight billion, eight hundred six million, four hundred seventy-seven thousand, nine hundred eighty-one".