1389578387 has 2 divisors, whose sum is σ = 1389578388. Its totient is φ = 1389578386.

The previous prime is 1389578383. The next prime is 1389578429. The reversal of 1389578387 is 7838759831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389578387 - 2² = 1389578383 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389578383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694789193 + 694789194.

It is an arithmetic number, because the mean of its divisors is an integer number (694789194).

Almost surely, 2^1389578387 is an apocalyptic number.

1389578387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389578387 is an equidigital number, since it uses as much as digits as its factorization.

1389578387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 59.

The square root of 1389578387 is about 37277.0490650749. The cubic root of 1389578387 is about 1115.9061820282.

The spelling of 1389578387 in words is "one billion, three hundred eighty-nine million, five hundred seventy-eight thousand, three hundred eighty-seven".