3985167805 has 4 divisors (see below), whose sum is σ = 4782201372. Its totient is φ = 3188134240.

The previous prime is 3985167793. The next prime is 3985167817. The reversal of 3985167805 is 5087615893.

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

It is an interprime number because it is at equal distance from previous prime (3985167793) and next prime (3985167817).

It can be written as a sum of positive squares in 2 ways, for example, as 665794809 + 3319372996 = 25803^2 + 57614^2 .

It is not a de Polignac number, because 3985167805 - 2⁵ = 3985167773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398516776 + ... + 398516785.

It is an arithmetic number, because the mean of its divisors is an integer number (1195550343).

Almost surely, 2^3985167805 is an apocalyptic number.

It is an amenable number.

3985167805 is a deficient number, since it is larger than the sum of its proper divisors (797033567).

3985167805 is an equidigital number, since it uses as much as digits as its factorization.

3985167805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797033566.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The square root of 3985167805 is about 63128.1855037827. The cubic root of 3985167805 is about 1585.4365683345.

The spelling of 3985167805 in words is "three billion, nine hundred eighty-five million, one hundred sixty-seven thousand, eight hundred five".