1323721 has 8 divisors (see below), whose sum is σ = 1525760. Its totient is φ = 1124928.

The previous prime is 1323691. The next prime is 1323727. The reversal of 1323721 is 1273231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1323721 - 2⁵ = 1323689 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 (1323727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (190720).

2^1323721 is an apocalyptic number.

It is an amenable number.

1323721 is a deficient number, since it is larger than the sum of its proper divisors (202039).

1323721 is a wasteful number, since it uses less digits than its factorization.

1323721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623.

The product of its digits is 252, while the sum is 19.

The square root of 1323721 is about 1150.5307470902. The cubic root of 1323721 is about 109.7991099272.

Adding to 1323721 its reverse (1273231), we get a palindrome (2596952).

The spelling of 1323721 in words is "one million, three hundred twenty-three thousand, seven hundred twenty-one".