388765 has 8 divisors (see below), whose sum is σ = 502488. Its totient is φ = 287040.

The previous prime is 388757. The next prime is 388777. The reversal of 388765 is 567883.

It can be written as a sum of positive squares in 4 ways, for example, as 12996 + 375769 = 114^2 + 613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 388765 - 2³ = 388757 is a prime.

It is a super-2 number, since 2×388765² = 302276450450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2926 + ... + 3055.

It is an arithmetic number, because the mean of its divisors is an integer number (62811).

2³⁸⁸⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

388765 is a deficient number, since it is larger than the sum of its proper divisors (113723).

388765 is a wasteful number, since it uses less digits than its factorization.

388765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999.

The product of its digits is 40320, while the sum is 37.

The square root of 388765 is about 623.5102244551. The cubic root of 388765 is about 72.9842337878.

The spelling of 388765 in words is "three hundred eighty-eight thousand, seven hundred sixty-five".