1380657809 has 2 divisors, whose sum is σ = 1380657810. Its totient is φ = 1380657808.

The previous prime is 1380657749. The next prime is 1380657841. The reversal of 1380657809 is 9087560831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1021441600 + 359216209 = 31960^2 + 18953^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380657809 - 2²⁴ = 1363880593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1380657209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690328904 + 690328905.

It is an arithmetic number, because the mean of its divisors is an integer number (690328905).

Almost surely, 2^1380657809 is an apocalyptic number.

It is an amenable number.

1380657809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380657809 is an equidigital number, since it uses as much as digits as its factorization.

1380657809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1380657809 is about 37157.2039986864. The cubic root of 1380657809 is about 1113.5131526057.

The spelling of 1380657809 in words is "one billion, three hundred eighty million, six hundred fifty-seven thousand, eight hundred nine".