388240855 has 8 divisors (see below), whose sum is σ = 465997392. Its totient is φ = 310520448.

The previous prime is 388240843. The next prime is 388240861. The reversal of 388240855 is 558042883.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388240855 is a prime.

It is a super-2 number, since 2×388240855² = 301461922982262050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29784 + ... + 40786.

It is an arithmetic number, because the mean of its divisors is an integer number (58249674).

Almost surely, 2^388240855 is an apocalyptic number.

388240855 is a deficient number, since it is larger than the sum of its proper divisors (77756537).

388240855 is a wasteful number, since it uses less digits than its factorization.

388240855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18065.

The product of its (nonzero) digits is 307200, while the sum is 43.

The square root of 388240855 is about 19703.8284351037. The cubic root of 388240855 is about 729.5141916891.

The spelling of 388240855 in words is "three hundred eighty-eight million, two hundred forty thousand, eight hundred fifty-five".