1666073 has 6 divisors (see below), whose sum is σ = 1713726. Its totient is φ = 1619712.

The previous prime is 1666061. The next prime is 1666081. The reversal of 1666073 is 3706661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 797449 + 868624 = 893^2 + 932^2 .

It is not a de Polignac number, because 1666073 - 2¹² = 1661977 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 761 + ... + 1977.

It is an arithmetic number, because the mean of its divisors is an integer number (285621).

2^1666073 is an apocalyptic number.

It is an amenable number.

1666073 is a deficient number, since it is larger than the sum of its proper divisors (47653).

1666073 is an equidigital number, since it uses as much as digits as its factorization.

1666073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 1666073 is about 1290.7645021459. The cubic root of 1666073 is about 118.5490310846.

The spelling of 1666073 in words is "one million, six hundred sixty-six thousand, seventy-three".