1389404465280 has 1024 divisors, whose sum is σ = 5516859801600. Its totient is φ = 328159641600.

The previous prime is 1389404465261. The next prime is 1389404465291. The reversal of 1389404465280 is 825644049831.

1389404465280 is a `hidden beast` number, since 1 + 3 + 89 + 40 + 446 + 5 + 2 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 884406895 + ... + 884408465.

It is an arithmetic number, because the mean of its divisors is an integer number (5387558400).

Almost surely, 2^{1389404465280} is an apocalyptic number.

1389404465280 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 1389404465280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2758429900800).

1389404465280 is an abundant number, since it is smaller than the sum of its proper divisors (4127455336320).

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

1389404465280 is a wasteful number, since it uses less digits than its factorization.

1389404465280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770 (or 1752 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 1389404465280 in words is "one trillion, three hundred eighty-nine billion, four hundred four million, four hundred sixty-five thousand, two hundred eighty".