1389113784 has 96 divisors (see below), whose sum is σ = 3871052640. Its totient is φ = 449740800.

The previous prime is 1389113749. The next prime is 1389113797. The reversal of 1389113784 is 4873119831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 757749 + ... + 759579.

It is an arithmetic number, because the mean of its divisors is an integer number (40323465).

Almost surely, 2^1389113784 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 1389113784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1935526320).

1389113784 is an abundant number, since it is smaller than the sum of its proper divisors (2481938856).

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

1389113784 is a wasteful number, since it uses less digits than its factorization.

1389113784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141 (or 2134 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1389113784 is about 37270.8167874008. The cubic root of 1389113784 is about 1115.7818010992.

The spelling of 1389113784 in words is "one billion, three hundred eighty-nine million, one hundred thirteen thousand, seven hundred eighty-four".