388387909877 has 12 divisors (see below), whose sum is σ = 427110355980. Its totient is φ = 352910669760.

The previous prime is 388387909859. The next prime is 388387909883. The reversal of 388387909877 is 778909783883.

It can be written as a sum of positive squares in 2 ways, for example, as 345284336881 + 43103572996 = 587609^2 + 207614^2 .

It is not a de Polignac number, because 388387909877 - 2⁸ = 388387909621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 388387909798 and 388387909807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388387909177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 515498 + ... + 1021035.

It is an arithmetic number, because the mean of its divisors is an integer number (35592529665).

Almost surely, 2^388387909877 is an apocalyptic number.

It is an amenable number.

388387909877 is a deficient number, since it is larger than the sum of its proper divisors (38722446103).

388387909877 is a wasteful number, since it uses less digits than its factorization.

388387909877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538644 (or 1538633 counting only the distinct ones).

The product of its (nonzero) digits is 1024192512, while the sum is 77.

The spelling of 388387909877 in words is "three hundred eighty-eight billion, three hundred eighty-seven million, nine hundred nine thousand, eight hundred seventy-seven".