388555 has 4 divisors (see below), whose sum is σ = 466272. Its totient is φ = 310840.

The previous prime is 388541. The next prime is 388567. The reversal of 388555 is 555883.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 388555 - 2¹³ = 380363 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 388555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38851 + ... + 38860.

It is an arithmetic number, because the mean of its divisors is an integer number (116568).

2³⁸⁸⁵⁵⁵ is an apocalyptic number.

388555 is a deficient number, since it is larger than the sum of its proper divisors (77717).

388555 is an equidigital number, since it uses as much as digits as its factorization.

388555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77716.

The product of its digits is 24000, while the sum is 34.

The square root of 388555 is about 623.3418002990. The cubic root of 388555 is about 72.9710900724.

Subtracting from 388555 its sum of digits (34), we obtain a triangular number (388521 = T₈₈₁).

The spelling of 388555 in words is "three hundred eighty-eight thousand, five hundred fifty-five".