1388605348881 has 27 divisors (see below), whose sum is σ = 2025235609033. Its totient is φ = 916835333640.

The previous prime is 1388605348811. The next prime is 1388605348937. The reversal of 1388605348881 is 1888435068831.

The square root of 1388605348881 is 1178391.

It is a perfect power (a square), and thus also a powerful number.

1388605348881 is a `hidden beast` number, since 1 + 38 + 8 + 60 + 534 + 8 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 1388605348881 - 2¹⁷ = 1388605217809 is a prime.

It is a super-2 number, since 2×1388605348881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388605348811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 378261676 + ... + 378265346.

Almost surely, 2^{1388605348881} is an apocalyptic number.

1388605348881 is the 1178391-st square number.

1388605348881 is the 589196-th centered octagonal number.

It is an amenable number.

1388605348881 is a deficient number, since it is larger than the sum of its proper divisors (636630260152).

1388605348881 is an frugal number, since it uses more digits than its factorization.

1388605348881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7562 (or 3781 counting only the distinct ones).

The product of its (nonzero) digits is 35389440, while the sum is 63.

The spelling of 1388605348881 in words is "one trillion, three hundred eighty-eight billion, six hundred five million, three hundred forty-eight thousand, eight hundred eighty-one".