39831983681 has 4 divisors (see below), whose sum is σ = 45522267072. Its totient is φ = 34141700292.

The previous prime is 39831983651. The next prime is 39831983683. The reversal of 39831983681 is 18638913893.

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 not a de Polignac number, because 39831983681 - 2³⁰ = 38758241857 is a prime.

It is a super-2 number, since 2×39831983681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39831983681.

It is not an unprimeable number, because it can be changed into a prime (39831983683) 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, 2845141685 + ... + 2845141698.

It is an arithmetic number, because the mean of its divisors is an integer number (11380566768).

Almost surely, 2^39831983681 is an apocalyptic number.

It is an amenable number.

39831983681 is a deficient number, since it is larger than the sum of its proper divisors (5690283391).

39831983681 is an equidigital number, since it uses as much as digits as its factorization.

39831983681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5690283390.

The product of its digits is 6718464, while the sum is 59.

The spelling of 39831983681 in words is "thirty-nine billion, eight hundred thirty-one million, nine hundred eighty-three thousand, six hundred eighty-one".