1665123 has 4 divisors (see below), whose sum is σ = 2220168. Its totient is φ = 1110080.

The previous prime is 1665121. The next prime is 1665137. The reversal of 1665123 is 3215661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1665123 - 2¹ = 1665121 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1665093 and 1665102.

It is not an unprimeable number, because it can be changed into a prime (1665121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277518 + ... + 277523.

It is an arithmetic number, because the mean of its divisors is an integer number (555042).

2^1665123 is an apocalyptic number.

1665123 is a deficient number, since it is larger than the sum of its proper divisors (555045).

1665123 is an equidigital number, since it uses as much as digits as its factorization.

1665123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555044.

The product of its digits is 1080, while the sum is 24.

The square root of 1665123 is about 1290.3964507081. The cubic root of 1665123 is about 118.5264944586.

The spelling of 1665123 in words is "one million, six hundred sixty-five thousand, one hundred twenty-three".