1378039609 has 2 divisors, whose sum is σ = 1378039610. Its totient is φ = 1378039608.

The previous prime is 1378039573. The next prime is 1378039627. The reversal of 1378039609 is 9069308731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 900180009 + 477859600 = 30003^2 + 21860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378039609 - 2²¹ = 1375942457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1378039679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689019804 + 689019805.

It is an arithmetic number, because the mean of its divisors is an integer number (689019805).

Almost surely, 2^1378039609 is an apocalyptic number.

It is an amenable number.

1378039609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378039609 is an equidigital number, since it uses as much as digits as its factorization.

1378039609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 1378039609 is about 37121.9558886651. The cubic root of 1378039609 is about 1112.8088397951.

The spelling of 1378039609 in words is "one billion, three hundred seventy-eight million, thirty-nine thousand, six hundred nine".