39681843841 has 4 divisors (see below), whose sum is σ = 39690699952. Its totient is φ = 39672987732.

The previous prime is 39681843829. The next prime is 39681843863. The reversal of 39681843841 is 14834818693.

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.

It is a cyclic number.

It is not a de Polignac number, because 39681843841 - 2⁹ = 39681843329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39681843821) 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, 4421331 + ... + 4430296.

It is an arithmetic number, because the mean of its divisors is an integer number (9922674988).

Almost surely, 2^39681843841 is an apocalyptic number.

It is an amenable number.

39681843841 is a deficient number, since it is larger than the sum of its proper divisors (8856111).

39681843841 is an equidigital number, since it uses as much as digits as its factorization.

39681843841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8856110.

The product of its digits is 3981312, while the sum is 55.

The spelling of 39681843841 in words is "thirty-nine billion, six hundred eighty-one million, eight hundred forty-three thousand, eight hundred forty-one".