1389789377 has 2 divisors, whose sum is σ = 1389789378. Its totient is φ = 1389789376.

The previous prime is 1389789367. The next prime is 1389789383. The reversal of 1389789377 is 7739879831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1389723841 + 65536 = 37279^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389789377 - 2⁴ = 1389789361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389789367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694894688 + 694894689.

It is an arithmetic number, because the mean of its divisors is an integer number (694894689).

Almost surely, 2^1389789377 is an apocalyptic number.

It is an amenable number.

1389789377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389789377 is an equidigital number, since it uses as much as digits as its factorization.

1389789377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16003008, while the sum is 62.

The square root of 1389789377 is about 37279.8789831727. The cubic root of 1389789377 is about 1115.9626579426.

The spelling of 1389789377 in words is "one billion, three hundred eighty-nine million, seven hundred eighty-nine thousand, three hundred seventy-seven".