1389089863 has 4 divisors (see below), whose sum is σ = 1587531280. Its totient is φ = 1190648448.

The previous prime is 1389089857. The next prime is 1389089869. The reversal of 1389089863 is 3689809831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3689809831 = 683 ⋅5402357.

It is an interprime number because it is at equal distance from previous prime (1389089857) and next prime (1389089869).

It is a cyclic number.

It is not a de Polignac number, because 1389089863 - 2¹³ = 1389081671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389089869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99220698 + ... + 99220711.

It is an arithmetic number, because the mean of its divisors is an integer number (396882820).

Almost surely, 2^1389089863 is an apocalyptic number.

1389089863 is a deficient number, since it is larger than the sum of its proper divisors (198441417).

1389089863 is an equidigital number, since it uses as much as digits as its factorization.

1389089863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198441416.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The square root of 1389089863 is about 37270.4958781071. The cubic root of 1389089863 is about 1115.7753963516.

The spelling of 1389089863 in words is "one billion, three hundred eighty-nine million, eighty-nine thousand, eight hundred sixty-three".