388378822821 has 16 divisors (see below), whose sum is σ = 578052203520. Its totient is φ = 229907124720.

The previous prime is 388378822807. The next prime is 388378822837. The reversal of 388378822821 is 128228873883.

It is not a de Polignac number, because 388378822821 - 2⁶ = 388378822757 is a prime.

It is a super-2 number, since 2×388378822821² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388378822841) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 136848061 + ... + 136850898.

It is an arithmetic number, because the mean of its divisors is an integer number (36128262720).

Almost surely, 2^388378822821 is an apocalyptic number.

It is an amenable number.

388378822821 is a deficient number, since it is larger than the sum of its proper divisors (189673380699).

388378822821 is a wasteful number, since it uses less digits than its factorization.

388378822821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273699016.

The product of its digits is 16515072, while the sum is 60.

The spelling of 388378822821 in words is "three hundred eighty-eight billion, three hundred seventy-eight million, eight hundred twenty-two thousand, eight hundred twenty-one".