1665345 has 16 divisors (see below), whose sum is σ = 2907072. Its totient is φ = 807360.

The previous prime is 1665343. The next prime is 1665421. The reversal of 1665345 is 5435661.

It is not a de Polignac number, because 1665345 - 2¹ = 1665343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665343) 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, 4882 + ... + 5211.

It is an arithmetic number, because the mean of its divisors is an integer number (181692).

2^1665345 is an apocalyptic number.

1665345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1665345 is a deficient number, since it is larger than the sum of its proper divisors (1241727).

1665345 is a wasteful number, since it uses less digits than its factorization.

1665345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10112.

The product of its digits is 10800, while the sum is 30.

The square root of 1665345 is about 1290.4824679166. The cubic root of 1665345 is about 118.5317616796.

The spelling of 1665345 in words is "one million, six hundred sixty-five thousand, three hundred forty-five".