1906165 has 4 divisors (see below), whose sum is σ = 2287404. Its totient is φ = 1524928.

The previous prime is 1906153. The next prime is 1906183. The reversal of 1906165 is 5616091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5616091 = 13 ⋅432007.

It can be written as a sum of positive squares in 2 ways, for example, as 1028196 + 877969 = 1014^2 + 937^2 .

It is a cyclic number.

It is not a de Polignac number, because 1906165 - 2⁵ = 1906133 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190612 + ... + 190621.

It is an arithmetic number, because the mean of its divisors is an integer number (571851).

2^1906165 is an apocalyptic number.

It is an amenable number.

1906165 is a deficient number, since it is larger than the sum of its proper divisors (381239).

1906165 is an equidigital number, since it uses as much as digits as its factorization.

1906165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381238.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1906165 is about 1380.6393446516. The cubic root of 1906165 is about 123.9900486291.

The spelling of 1906165 in words is "one million, nine hundred six thousand, one hundred sixty-five".