1001993 has 4 divisors (see below), whose sum is σ = 1023360. Its totient is φ = 980628.

The previous prime is 1001989. The next prime is 1002017. The reversal of 1001993 is 3991001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001993 - 2² = 1001989 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 (1001933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10613 + ... + 10706.

It is an arithmetic number, because the mean of its divisors is an integer number (255840).

2^1001993 is an apocalyptic number.

It is an amenable number.

1001993 is a deficient number, since it is larger than the sum of its proper divisors (21367).

1001993 is an equidigital number, since it uses as much as digits as its factorization.

1001993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21366.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1001993 is about 1000.9960039880. The cubic root of 1001993 is about 100.0663892483.

Adding to 1001993 its reverse (3991001), we get a palindrome (4992994).

The spelling of 1001993 in words is "one million, one thousand, nine hundred ninety-three".