1389178752 has 128 divisors (see below), whose sum is σ = 3989317920. Its totient is φ = 425779200.

The previous prime is 1389178751. The next prime is 1389178781. The reversal of 1389178752 is 2578719831.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 1389178695 and 1389178704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389178751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2101302 + ... + 2101962.

Almost surely, 2^1389178752 is an apocalyptic number.

1389178752 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 1389178752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1994658960).

1389178752 is an abundant number, since it is smaller than the sum of its proper divisors (2600139168).

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

1389178752 is a wasteful number, since it uses less digits than its factorization.

1389178752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112 (or 1100 counting only the distinct ones).

The product of its digits is 846720, while the sum is 51.

The square root of 1389178752 is about 37271.6883438355. The cubic root of 1389178752 is about 1115.7991956383.

The spelling of 1389178752 in words is "one billion, three hundred eighty-nine million, one hundred seventy-eight thousand, seven hundred fifty-two".