3905704988639 has 4 divisors (see below), whose sum is σ = 3996535337256. Its totient is φ = 3814874640024.

The previous prime is 3905704988629. The next prime is 3905704988707. The reversal of 3905704988639 is 9368894075093.

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

It is a cyclic number.

It is not a de Polignac number, because 3905704988639 - 2¹² = 3905704984543 is a prime.

It is a super-2 number, since 2×3905704988639² (a number of 26 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 (3905704988629) 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, 45415174244 + ... + 45415174329.

It is an arithmetic number, because the mean of its divisors is an integer number (999133834314).

Almost surely, 2^{3905704988639} is an apocalyptic number.

3905704988639 is a deficient number, since it is larger than the sum of its proper divisors (90830348617).

3905704988639 is an equidigital number, since it uses as much as digits as its factorization.

3905704988639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90830348616.

The product of its (nonzero) digits is 352719360, while the sum is 71.

The spelling of 3905704988639 in words is "three trillion, nine hundred five billion, seven hundred four million, nine hundred eighty-eight thousand, six hundred thirty-nine".