1389994880 has 128 divisors (see below), whose sum is σ = 3509697600. Its totient is φ = 525352960.

The previous prime is 1389994877. The next prime is 1389994891. The reversal of 1389994880 is 884999831.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309550 + ... + 1310610.

Almost surely, 2^1389994880 is an apocalyptic number.

1389994880 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 1389994880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1754848800).

1389994880 is an abundant number, since it is smaller than the sum of its proper divisors (2119702720).

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

1389994880 is a wasteful number, since it uses less digits than its factorization.

1389994880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192 (or 1180 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 59.

The square root of 1389994880 is about 37282.6351000033. The cubic root of 1389994880 is about 1116.0176596513.

The spelling of 1389994880 in words is "one billion, three hundred eighty-nine million, nine hundred ninety-four thousand, eight hundred eighty".