1993666 has 12 divisors (see below), whose sum is σ = 3070386. Its totient is φ = 970880.

The previous prime is 1993661. The next prime is 1993679. The reversal of 1993666 is 6663991.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 772641 + 1221025 = 879^2 + 1105^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993661) 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, 3066 + ... + 3658.

2^1993666 is an apocalyptic number.

1993666 is a deficient number, since it is larger than the sum of its proper divisors (1076720).

1993666 is an equidigital number, since it uses as much as digits as its factorization.

1993666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 636 counting only the distinct ones).

The product of its digits is 52488, while the sum is 40.

The square root of 1993666 is about 1411.9723793333. The cubic root of 1993666 is about 125.8589586668.

It can be divided in two parts, 19936 and 66, that added together give a palindrome (20002).

The spelling of 1993666 in words is "one million, nine hundred ninety-three thousand, six hundred sixty-six".