1816165 has 8 divisors (see below), whose sum is σ = 2347128. Its totient is φ = 1341120.

The previous prime is 1816159. The next prime is 1816187. The reversal of 1816165 is 5616181.

It can be written as a sum of positive squares in 4 ways, for example, as 25921 + 1790244 = 161^2 + 1338^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1816165 - 2¹¹ = 1814117 is a prime.

It is an alternating number because its digits alternate between odd and even.

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 7 ways as a sum of consecutive naturals, for example, 13906 + ... + 14035.

It is an arithmetic number, because the mean of its divisors is an integer number (293391).

2^1816165 is an apocalyptic number.

It is an amenable number.

1816165 is a deficient number, since it is larger than the sum of its proper divisors (530963).

1816165 is a wasteful number, since it uses less digits than its factorization.

1816165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27959.

The product of its digits is 1440, while the sum is 28.

The square root of 1816165 is about 1347.6516612241. The cubic root of 1816165 is about 122.0070989330.

The spelling of 1816165 in words is "one million, eight hundred sixteen thousand, one hundred sixty-five".