1389387264 has 80 divisors (see below), whose sum is σ = 3820945920. Its totient is φ = 448174080.

The previous prime is 1389387253. The next prime is 1389387287. The reversal of 1389387264 is 4627839831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33027 + ... + 62205.

It is an arithmetic number, because the mean of its divisors is an integer number (47761824).

Almost surely, 2^1389387264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389387264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1910472960).

1389387264 is an abundant number, since it is smaller than the sum of its proper divisors (2431558656).

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

1389387264 is an equidigital number, since it uses as much as digits as its factorization.

1389387264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29231 (or 29215 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 1389387264 is about 37274.4854290438. The cubic root of 1389387264 is about 1115.8550189997.

The spelling of 1389387264 in words is "one billion, three hundred eighty-nine million, three hundred eighty-seven thousand, two hundred sixty-four".