1389998880 has 336 divisors, whose sum is σ = 5220613944. Its totient is φ = 348364800.

The previous prime is 1389998867. The next prime is 1389998891. The reversal of 1389998880 is 888999831.

It can be written as a sum of positive squares in 4 ways, for example, as 1372257936 + 17740944 = 37044^2 + 4212^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1982530 + ... + 1983230.

Almost surely, 2^1389998880 is an apocalyptic number.

1389998880 is a gapful number since it is divisible by the number (10) 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 1389998880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2610306972).

1389998880 is an abundant number, since it is smaller than the sum of its proper divisors (3830615064).

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

1389998880 is an equidigital number, since it uses as much as digits as its factorization.

1389998880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 63.

The square root of 1389998880 is about 37282.6887442416. The cubic root of 1389998880 is about 1116.0187301747.

The spelling of 1389998880 in words is "one billion, three hundred eighty-nine million, nine hundred ninety-eight thousand, eight hundred eighty".