1665043 has 2 divisors, whose sum is σ = 1665044. Its totient is φ = 1665042.

The previous prime is 1665029. The next prime is 1665061. The reversal of 1665043 is 3405661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1665043 - 2¹⁷ = 1533971 is a prime.

It is equal to p₁₂₅₆₇₄ and since 1665043 and 125674 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664999 and 1665017.

It is not a weakly prime, because it can be changed into another prime (1665023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832521 + 832522.

It is an arithmetic number, because the mean of its divisors is an integer number (832522).

2^1665043 is an apocalyptic number.

1665043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665043 is an equidigital number, since it uses as much as digits as its factorization.

1665043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1665043 is about 1290.3654521104. The cubic root of 1665043 is about 118.5245962462.

The spelling of 1665043 in words is "one million, six hundred sixty-five thousand, forty-three".