1493387809 has 2 divisors, whose sum is σ = 1493387810. Its totient is φ = 1493387808.

The previous prime is 1493387803. The next prime is 1493387839. The reversal of 1493387809 is 9087833941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1463445025 + 29942784 = 38255^2 + 5472^2 .

It is a cyclic number.

It is not a de Polignac number, because 1493387809 - 2¹⁹ = 1492863521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1493387803) 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, 746693904 + 746693905.

It is an arithmetic number, because the mean of its divisors is an integer number (746693905).

Almost surely, 2^1493387809 is an apocalyptic number.

It is an amenable number.

1493387809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1493387809 is an equidigital number, since it uses as much as digits as its factorization.

1493387809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 1493387809 is about 38644.3761626449. The cubic root of 1493387809 is about 1143.0297495897.

The spelling of 1493387809 in words is "one billion, four hundred ninety-three million, three hundred eighty-seven thousand, eight hundred nine".