1389396887 has 2 divisors, whose sum is σ = 1389396888. Its totient is φ = 1389396886.

The previous prime is 1389396881. The next prime is 1389396901. The reversal of 1389396887 is 7886939831.

It is a weak prime.

It is an emirp because it is prime and its reverse (7886939831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1389396887 - 2⁶ = 1389396823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389396881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694698443 + 694698444.

It is an arithmetic number, because the mean of its divisors is an integer number (694698444).

Almost surely, 2^1389396887 is an apocalyptic number.

1389396887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389396887 is an equidigital number, since it uses as much as digits as its factorization.

1389396887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 62.

The square root of 1389396887 is about 37274.6145117559. The cubic root of 1389396887 is about 1115.8575951588.

The spelling of 1389396887 in words is "one billion, three hundred eighty-nine million, three hundred ninety-six thousand, eight hundred eighty-seven".