388865 has 4 divisors (see below), whose sum is σ = 466644. Its totient is φ = 311088.

The previous prime is 388859. The next prime is 388879. The reversal of 388865 is 568883.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 85264 + 303601 = 292^2 + 551^2 .

It is a cyclic number.

It is not a de Polignac number, because 388865 - 2¹⁴ = 372481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38882 + ... + 38891.

It is an arithmetic number, because the mean of its divisors is an integer number (116661).

2³⁸⁸⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

388865 is a deficient number, since it is larger than the sum of its proper divisors (77779).

388865 is an equidigital number, since it uses as much as digits as its factorization.

388865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77778.

The product of its digits is 46080, while the sum is 38.

The square root of 388865 is about 623.5904104458. The cubic root of 388865 is about 72.9904910364.

The spelling of 388865 in words is "three hundred eighty-eight thousand, eight hundred sixty-five".