1662728393 has 2 divisors, whose sum is σ = 1662728394. Its totient is φ = 1662728392.

The previous prime is 1662728387. The next prime is 1662728453. The reversal of 1662728393 is 3938272661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151380624 + 511347769 = 33932^2 + 22613^2 .

It is an emirp because it is prime and its reverse (3938272661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1662728393 - 2⁴ = 1662728377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1662728693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831364196 + 831364197.

It is an arithmetic number, because the mean of its divisors is an integer number (831364197).

Almost surely, 2^1662728393 is an apocalyptic number.

It is an amenable number.

1662728393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662728393 is an equidigital number, since it uses as much as digits as its factorization.

1662728393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 1662728393 is about 40776.5667142294. The cubic root of 1662728393 is about 1184.6964970150.

The spelling of 1662728393 in words is "one billion, six hundred sixty-two million, seven hundred twenty-eight thousand, three hundred ninety-three".