1321993 has 4 divisors (see below), whose sum is σ = 1324800. Its totient is φ = 1319188.

The previous prime is 1321981. The next prime is 1321997. The reversal of 1321993 is 3991231.

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: 3991231 = 181 ⋅22051.

It is a cyclic number.

It is not a de Polignac number, because 1321993 - 2⁵ = 1321961 is a prime.

It is a Duffinian number.

1321993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1321997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505 + ... + 1702.

It is an arithmetic number, because the mean of its divisors is an integer number (331200).

2^1321993 is an apocalyptic number.

It is an amenable number.

1321993 is a deficient number, since it is larger than the sum of its proper divisors (2807).

1321993 is an equidigital number, since it uses as much as digits as its factorization.

1321993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806.

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

The square root of 1321993 is about 1149.7795440866. The cubic root of 1321993 is about 109.7513114657.

The spelling of 1321993 in words is "one million, three hundred twenty-one thousand, nine hundred ninety-three".