1673666 has 4 divisors (see below), whose sum is σ = 2510502. Its totient is φ = 836832.

The previous prime is 1673663. The next prime is 1673669. The reversal of 1673666 is 6663761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6663761 = 13 ⋅512597.

It is an interprime number because it is at equal distance from previous prime (1673663) and next prime (1673669).

It can be written as a sum of positive squares in only one way, i.e., 1600225 + 73441 = 1265^2 + 271^2 .

It is not an unprimeable number, because it can be changed into a prime (1673663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 418415 + ... + 418418.

2^1673666 is an apocalyptic number.

1673666 is a deficient number, since it is larger than the sum of its proper divisors (836836).

1673666 is an equidigital number, since it uses as much as digits as its factorization.

1673666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836835.

The product of its digits is 27216, while the sum is 35.

The square root of 1673666 is about 1293.7024387393. The cubic root of 1673666 is about 118.7288508966.

The spelling of 1673666 in words is "one million, six hundred seventy-three thousand, six hundred sixty-six".