1388508121980 has 480 divisors, whose sum is σ = 5277572923392. Its totient is φ = 298831680000.

The previous prime is 1388508121939. The next prime is 1388508122003. The reversal of 1388508121980 is 891218058831.

1388508121980 is a `hidden beast` number, since 1 + 3 + 8 + 8 + 508 + 121 + 9 + 8 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 12953605 + ... + 13060355.

Almost surely, 2^{1388508121980} is an apocalyptic number.

1388508121980 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 1388508121980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2638786461696).

1388508121980 is an abundant number, since it is smaller than the sum of its proper divisors (3889064801412).

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

1388508121980 is a wasteful number, since it uses less digits than its factorization.

1388508121980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106847 (or 106836 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 54.

The spelling of 1388508121980 in words is "one trillion, three hundred eighty-eight billion, five hundred eight million, one hundred twenty-one thousand, nine hundred eighty".