1404721 has 2 divisors, whose sum is σ = 1404722. Its totient is φ = 1404720.

The previous prime is 1404709. The next prime is 1404737. The reversal of 1404721 is 1274041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1392400 + 12321 = 1180^2 + 111^2 .

It is an emirp because it is prime and its reverse (1274041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1404721 - 2¹¹ = 1402673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1404791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702360 + 702361.

It is an arithmetic number, because the mean of its divisors is an integer number (702361).

2^1404721 is an apocalyptic number.

It is an amenable number.

1404721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1404721 is an equidigital number, since it uses as much as digits as its factorization.

1404721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 1404721 is about 1185.2092642230. The cubic root of 1404721 is about 111.9944990921.

Adding to 1404721 its reverse (1274041), we get a palindrome (2678762).

The spelling of 1404721 in words is "one million, four hundred four thousand, seven hundred twenty-one".