1455721 has 2 divisors, whose sum is σ = 1455722. Its totient is φ = 1455720.

The previous prime is 1455703. The next prime is 1455757. The reversal of 1455721 is 1275541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1265625 + 190096 = 1125^2 + 436^2 .

It is an emirp because it is prime and its reverse (1275541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1455721 - 2¹³ = 1447529 is a prime.

1455721 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1455781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 727860 + 727861.

It is an arithmetic number, because the mean of its divisors is an integer number (727861).

2^1455721 is an apocalyptic number.

It is an amenable number.

1455721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1455721 is an equidigital number, since it uses as much as digits as its factorization.

1455721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1400, while the sum is 25.

The square root of 1455721 is about 1206.5326352818. The cubic root of 1455721 is about 113.3337821974. Note that the first 3 decimals are identical.

The spelling of 1455721 in words is "one million, four hundred fifty-five thousand, seven hundred twenty-one".