1324721 has 2 divisors, whose sum is σ = 1324722. Its totient is φ = 1324720.

The previous prime is 1324717. The next prime is 1324733. The reversal of 1324721 is 1274231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1290496 + 34225 = 1136^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1324721 - 2² = 1324717 is a prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1324693 and 1324702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1324621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662360 + 662361.

It is an arithmetic number, because the mean of its divisors is an integer number (662361).

2^1324721 is an apocalyptic number.

It is an amenable number.

1324721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1324721 is an equidigital number, since it uses as much as digits as its factorization.

1324721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 1324721 is about 1150.9652470861. The cubic root of 1324721 is about 109.8267520744.

Adding to 1324721 its reverse (1274231), we get a palindrome (2598952).

The spelling of 1324721 in words is "one million, three hundred twenty-four thousand, seven hundred twenty-one".