3902165 has 4 divisors (see below), whose sum is σ = 4682604. Its totient is φ = 3121728.

The previous prime is 3902149. The next prime is 3902167. The reversal of 3902165 is 5612093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5612093 = 1789 ⋅3137.

It can be written as a sum of positive squares in 2 ways, for example, as 1868689 + 2033476 = 1367^2 + 1426^2 .

It is a cyclic number.

It is not a de Polignac number, because 3902165 - 2⁴ = 3902149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3902167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390212 + ... + 390221.

It is an arithmetic number, because the mean of its divisors is an integer number (1170651).

Almost surely, 2^3902165 is an apocalyptic number.

It is an amenable number.

3902165 is a deficient number, since it is larger than the sum of its proper divisors (780439).

3902165 is an equidigital number, since it uses as much as digits as its factorization.

3902165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780438.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 3902165 is about 1975.3898349440. The cubic root of 3902165 is about 157.4352131288.

It can be divided in two parts, 390 and 2165, that multiplied together give a triangular number (844350 = T₁₂₉₉).

The spelling of 3902165 in words is "three million, nine hundred two thousand, one hundred sixty-five".