1993321 has 4 divisors (see below), whose sum is σ = 2174544. Its totient is φ = 1812100.

The previous prime is 1993319. The next prime is 1993339. The reversal of 1993321 is 1233991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1233991 = 11 ⋅112181.

It is a cyclic number.

It is not a de Polignac number, because 1993321 - 2¹ = 1993319 is a prime.

It is a Duffinian number.

1993321 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1993321.

It is not an unprimeable number, because it can be changed into a prime (1993921) 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, 90595 + ... + 90616.

It is an arithmetic number, because the mean of its divisors is an integer number (543636).

2^1993321 is an apocalyptic number.

1993321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1993321 is a deficient number, since it is larger than the sum of its proper divisors (181223).

1993321 is a wasteful number, since it uses less digits than its factorization.

1993321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181222.

The product of its digits is 1458, while the sum is 28.

The square root of 1993321 is about 1411.8502045189. The cubic root of 1993321 is about 125.8516983658.

The spelling of 1993321 in words is "one million, nine hundred ninety-three thousand, three hundred twenty-one".