1389616128 has 88 divisors (see below), whose sum is σ = 4115452560. Its totient is φ = 463196160.

The previous prime is 1389616127. The next prime is 1389616181. The reversal of 1389616128 is 8216169831.

1389616128 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 616 + 1 + 28 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389616121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2518 + ... + 52778.

Almost surely, 2^1389616128 is an apocalyptic number.

1389616128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389616128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2057726280).

1389616128 is an abundant number, since it is smaller than the sum of its proper divisors (2725836432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389616128 is an equidigital number, since it uses as much as digits as its factorization.

1389616128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50290 (or 50266 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1389616128 is about 37277.5552846482. Note that the first 3 decimals coincide. The cubic root of 1389616128 is about 1115.9162846210.

The spelling of 1389616128 in words is "one billion, three hundred eighty-nine million, six hundred sixteen thousand, one hundred twenty-eight".