1993663 has 24 divisors (see below), whose sum is σ = 2544480. Its totient is φ = 1552320.

The previous prime is 1993661. The next prime is 1993679. The reversal of 1993663 is 3663991.

It is not a de Polignac number, because 1993663 - 2¹ = 1993661 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a d-powerful number, because it can be written as 1 + 9 + 9⁵ + 3¹⁰ + 6⁴ + 6⁷ + 3¹³ .

It is a Duffinian number.

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 23 ways as a sum of consecutive naturals, for example, 32653 + ... + 32713.

It is an arithmetic number, because the mean of its divisors is an integer number (106020).

2^1993663 is an apocalyptic number.

1993663 is a deficient number, since it is larger than the sum of its proper divisors (550817).

1993663 is a wasteful number, since it uses less digits than its factorization.

1993663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 120 counting only the distinct ones).

The product of its digits is 26244, while the sum is 37.

The square root of 1993663 is about 1411.9713169891. The cubic root of 1993663 is about 125.8588955373.

The spelling of 1993663 in words is "one million, nine hundred ninety-three thousand, six hundred sixty-three".