388705 has 12 divisors (see below), whose sum is σ = 497340. Its totient is φ = 291584.

The previous prime is 388699. The next prime is 388711. The reversal of 388705 is 507883.

It is an interprime number because it is at equal distance from previous prime (388699) and next prime (388711).

It can be written as a sum of positive squares in 6 ways, for example, as 576 + 388129 = 24^2 + 623^2 .

It is not a de Polignac number, because 388705 - 2³ = 388697 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1311 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (41445).

2³⁸⁸⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

388705 is a deficient number, since it is larger than the sum of its proper divisors (108635).

388705 is a wasteful number, since it uses less digits than its factorization.

388705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 388705 is about 623.4621079103. The cubic root of 388705 is about 72.9804789237.

The spelling of 388705 in words is "three hundred eighty-eight thousand, seven hundred five".