1388820001320 has 48 divisors (see below), whose sum is σ = 4513665005460. Its totient is φ = 370352000256.

The previous prime is 1388820001313. The next prime is 1388820001397. The reversal of 1388820001320 is 231000288831.

It can be written as a sum of positive squares in 2 ways, for example, as 1266178560516 + 122641440804 = 1125246^2 + 350202^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1928916309 + ... + 1928917028.

Almost surely, 2^{1388820001320} is an apocalyptic number.

1388820001320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388820001320 is an abundant number, since it is smaller than the sum of its proper divisors (3124845004140).

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

1388820001320 is a wasteful number, since it uses less digits than its factorization.

1388820001320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857833354 (or 3857833347 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 1388820001320 in words is "one trillion, three hundred eighty-eight billion, eight hundred twenty million, one thousand, three hundred twenty".