165783 has 8 divisors (see below), whose sum is σ = 224368. Its totient is φ = 108864.

The previous prime is 165779. The next prime is 165799. The reversal of 165783 is 387561.

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

It is not a de Polignac number, because 165783 - 2² = 165779 is a prime.

It is a Duffinian number.

165783 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 165783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160 + ... + 597.

It is an arithmetic number, because the mean of its divisors is an integer number (28046).

2¹⁶⁵⁷⁸³ is an apocalyptic number.

165783 is a deficient number, since it is larger than the sum of its proper divisors (58585).

165783 is an equidigital number, since it uses as much as digits as its factorization.

165783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833.

The product of its digits is 5040, while the sum is 30.

The square root of 165783 is about 407.1645858863. The cubic root of 165783 is about 54.9346883143.

The spelling of 165783 in words is "one hundred sixty-five thousand, seven hundred eighty-three".