1389789912 has 64 divisors (see below), whose sum is σ = 3991495680. Its totient is φ = 395016192.

The previous prime is 1389789889. The next prime is 1389789949. The reversal of 1389789912 is 2199879831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10993 + ... + 53855.

It is an arithmetic number, because the mean of its divisors is an integer number (62367120).

Almost surely, 2^1389789912 is an apocalyptic number.

1389789912 is a gapful number since it is divisible by the number (12) 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 1389789912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1995747840).

1389789912 is an abundant number, since it is smaller than the sum of its proper divisors (2601705768).

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

1389789912 is a wasteful number, since it uses less digits than its factorization.

1389789912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43072 (or 43068 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 57.

The square root of 1389789912 is about 37279.8861586245. The cubic root of 1389789912 is about 1115.9628011393.

The spelling of 1389789912 in words is "one billion, three hundred eighty-nine million, seven hundred eighty-nine thousand, nine hundred twelve".