1665105 has 16 divisors (see below), whose sum is σ = 2869440. Its totient is φ = 819648.

The previous prime is 1665091. The next prime is 1665107. The reversal of 1665105 is 5015661.

It is not a de Polignac number, because 1665105 - 2⁵ = 1665073 is a prime.

It is a super-2 number, since 2×1665105² = 5545149322050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1665107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4075 + ... + 4464.

It is an arithmetic number, because the mean of its divisors is an integer number (179340).

2^1665105 is an apocalyptic number.

1665105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1665105 is a deficient number, since it is larger than the sum of its proper divisors (1204335).

1665105 is a wasteful number, since it uses less digits than its factorization.

1665105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8560.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1665105 is about 1290.3894760885. The cubic root of 1665105 is about 118.5260673662.

It can be divided in two parts, 1665 and 105, that added together give a triangular number (1770 = T₅₉).

The spelling of 1665105 in words is "one million, six hundred sixty-five thousand, one hundred five".