3957890165 has 4 divisors (see below), whose sum is σ = 4749468204. Its totient is φ = 3166312128.

The previous prime is 3957890119. The next prime is 3957890177. The reversal of 3957890165 is 5610987593.

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

It can be written as a sum of positive squares in 2 ways, for example, as 651985156 + 3305905009 = 25534^2 + 57497^2 .

It is a cyclic number.

It is not a de Polignac number, because 3957890165 - 2³⁰ = 2884148341 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, 395789012 + ... + 395789021.

It is an arithmetic number, because the mean of its divisors is an integer number (1187367051).

Almost surely, 2^3957890165 is an apocalyptic number.

It is an amenable number.

3957890165 is a deficient number, since it is larger than the sum of its proper divisors (791578039).

3957890165 is an equidigital number, since it uses as much as digits as its factorization.

3957890165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791578038.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The square root of 3957890165 is about 62911.7649172236. The cubic root of 3957890165 is about 1581.8109563015.

The spelling of 3957890165 in words is "three billion, nine hundred fifty-seven million, eight hundred ninety thousand, one hundred sixty-five".