1336721 has 4 divisors (see below), whose sum is σ = 1342692. Its totient is φ = 1330752.

The previous prime is 1336663. The next prime is 1336729. The reversal of 1336721 is 1276331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1276331 = 7 ⋅182333.

It can be written as a sum of positive squares in 2 ways, for example, as 102400 + 1234321 = 320^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1336721 - 2¹⁴ = 1320337 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1336729) 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, 2636 + ... + 3101.

It is an arithmetic number, because the mean of its divisors is an integer number (335673).

2^1336721 is an apocalyptic number.

It is an amenable number.

1336721 is a deficient number, since it is larger than the sum of its proper divisors (5971).

1336721 is an equidigital number, since it uses as much as digits as its factorization.

1336721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5970.

The product of its digits is 756, while the sum is 23.

The square root of 1336721 is about 1156.1665104992. The cubic root of 1336721 is about 110.1573780362.

The spelling of 1336721 in words is "one million, three hundred thirty-six thousand, seven hundred twenty-one".