388551 has 4 divisors (see below), whose sum is σ = 518072. Its totient is φ = 259032.

The previous prime is 388541. The next prime is 388567. The reversal of 388551 is 155883.

It is a happy number.

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

It is not a de Polignac number, because 388551 - 2⁵ = 388519 is a prime.

It is a D-number.

It is a Duffinian number.

388551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388541) by changing a digit.

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, 64756 + ... + 64761.

It is an arithmetic number, because the mean of its divisors is an integer number (129518).

2³⁸⁸⁵⁵¹ is an apocalyptic number.

388551 is a deficient number, since it is larger than the sum of its proper divisors (129521).

388551 is a wasteful number, since it uses less digits than its factorization.

388551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129520.

The product of its digits is 4800, while the sum is 30.

The square root of 388551 is about 623.3385917782. The cubic root of 388551 is about 72.9708396700.

Subtracting from 388551 its sum of digits (30), we obtain a triangular number (388521 = T₈₈₁).

It can be divided in two parts, 3885 and 51, that multiplied together give a triangular number (198135 = T₆₂₉).

The spelling of 388551 in words is "three hundred eighty-eight thousand, five hundred fifty-one".