1389053779 has 2 divisors, whose sum is σ = 1389053780. Its totient is φ = 1389053778.

The previous prime is 1389053717. The next prime is 1389053807. The reversal of 1389053779 is 9773509831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1389053779 - 2¹¹ = 1389051731 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389050779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694526889 + 694526890.

It is an arithmetic number, because the mean of its divisors is an integer number (694526890).

Almost surely, 2^1389053779 is an apocalyptic number.

1389053779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389053779 is an equidigital number, since it uses as much as digits as its factorization.

1389053779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The square root of 1389053779 is about 37270.0117923244. The cubic root of 1389053779 is about 1115.7657348725.

The spelling of 1389053779 in words is "one billion, three hundred eighty-nine million, fifty-three thousand, seven hundred seventy-nine".