388855757889 has 45 divisors (see below), whose sum is σ = 585539662323. Its totient is φ = 257175606528.

The previous prime is 388855757783. The next prime is 388855757897. The reversal of 388855757889 is 988757558883.

The square root of 388855757889 is 623583.

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

388855757889 is a `hidden beast` number, since 3 + 8 + 8 + 8 + 557 + 57 + 8 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 94215233025 + 294640524864 = 306945^2 + 542808^2 .

It is not a de Polignac number, because 388855757889 - 2⁷ = 388855757761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (388855759889) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1083163492 + ... + 1083163850.

Almost surely, 2^388855757889 is an apocalyptic number.

388855757889 is the 623583-rd square number.

388855757889 is the 311792-nd centered octagonal number.

It is an amenable number.

388855757889 is a deficient number, since it is larger than the sum of its proper divisors (196683904434).

388855757889 is an frugal number, since it uses more digits than its factorization.

388855757889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 555 counting only the distinct ones).

The product of its digits is 5419008000, while the sum is 81.

Multiplying 388855757889 by its sum of digits (81), we get a square (31497316389009 = 5612247²).

388855757889 divided by its sum of digits (81) gives a square (4800688369 = 69287²).

The spelling of 388855757889 in words is "three hundred eighty-eight billion, eight hundred fifty-five million, seven hundred fifty-seven thousand, eight hundred eighty-nine".