1993999 has 4 divisors (see below), whose sum is σ = 2278864. Its totient is φ = 1709136.

The previous prime is 1993997. The next prime is 1994033. The reversal of 1993999 is 9993991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1993999 - 2¹ = 1993997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142422 + ... + 142435.

It is an arithmetic number, because the mean of its divisors is an integer number (569716).

2^1993999 is an apocalyptic number.

1993999 is a deficient number, since it is larger than the sum of its proper divisors (284865).

1993999 is an equidigital number, since it uses as much as digits as its factorization.

1993999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284864.

The product of its digits is 177147, while the sum is 49.

The square root of 1993999 is about 1412.0902945633. The cubic root of 1993999 is about 125.8659656412.

It can be divided in two parts, 1993 and 999, that added together give a palindrome (2992).

The spelling of 1993999 in words is "one million, nine hundred ninety-three thousand, nine hundred ninety-nine".